Water. Formula: H 2 O. Molecular weight: 18.0153. IUPAC Standard InChI: InChI=1S/H2O/h1H2. Copy Sheet of paper on top of another sheet. IUPAC Standard InChIKey: XLYOFNOQVPJJNP-UHFFFAOYSA-N. Copy Sheet of paper on top of another sheet. May 15, 2022 · Molecular Weight. The weight of a molecule is the sum of the weights of the atoms of which it is made. The unit of weight is the dalton, one-twelfth the weight of an atom of 12 C. Thus the molecular weight (MW) of water is 18 daltons. Jan 27, 2022 · Each mole of water contains 6.022×10 23 water molecules. So, the mass of a single water molecule is the molar mass (18.01 g/mol) divided by Avogadro’s number (6.022×10 23 molecules/mole). mass of individual water molecule = 18.01 g/mol ÷ 6.022×10 23 molecules/mol = 2.99 x 10 -23 grams. Jul 29, 2021 · molecular mass of ethanol = 62.068 amu. The molar mass of ethylene glycol is 62.068 g/mol. B The number of moles of ethylene glycol present in 35.00 g can be calculated by dividing the mass (in grams) by the molar mass (in grams per mole): 35.00gethyleneglycol(1molethyleneglycol ( g)) 62.068gethyleneglycol) = 0.5639molethyleneglycol. Online Molecular Weight Calculator that computes the molecular mass of any molecule or element. ... of 1 gram of benzene in a certain amount of water converts to N A ... Water is a relatively "light" molecule with a molar mass (molecular weight) of 18.01, giving the vapor a density of 0.623 relative to air. The high dielectric constant of water is largely responsible for its good solvent properties.It is, however, a weak electrolyte when pure, but with dissolved ions increases its conductivity by several orders of magnitude.Atomic mass of H = 1 g Atomic mass of O = 16 g Atomic mass of Cu = 63. 5 g Atomic mass of S = 32 g Molecular mass of CuSO 4 . 5 H 2 O = Atomic mass of Cu + atomic mass of S + ( 9 × atomic mass of O) + ( 10 × atomic mass of H) = 63. 5 + 32 + 9 × 16 + 10 × 1 = 249. 5 gm / mole. Hence, the molecular mass of CuSO 4 . 5 H 2 O is 249.5 g/mol.Like other molecules, water molecules diffuse down a concentration gradient, from an area of higher free water concentration to an area of lower free water concentration. This means that water will move across a semipermeable membrane, like the cell membrane, in the direction of the higher solute concentration. ... Molecular weight …Online Molecular Weight Calculator that computes the molecular mass of any molecule or element. ... of 1 gram of benzene in a certain amount of water converts to N A ... The molecular weight increases during the first 30% conversion, reaches a plateau, ... washing with water, drying, fractionation over CaH 2 and final purification over a sodium mirror. Convenient initiators are triflic acid (trifluoromethanesulfonic acid) and its anhydride, which can be purified by distillation (b.p. 78 ...Sample Molecular Weight Calculation. The chemical formula for water is H2O, which means this molecule has 3 atoms: 2 of hydrogen (H) and 1 oxygen (O) atom. Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. In order to calculate the molecular weight of one water ... The weight of 1 gallon of pure water at room temperature is 8.329 pounds. The weight varies with temperature, ranging from 8.344 pounds at 32 F, the freezing point, to 7.996 pounds...The molecular weight of a substance is the weight in atomic mass units of all the atoms in a given formula. Definition #2: An atomic mass unit is defined as 1/12 the weight of one atom of the carbon-12 isotope. The most complete definition is a bit more technical (1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and ... Likewise, the molecular mass of an aspirin molecule, C 9 H 8 O 4, is the sum of the atomic masses of nine carbon atoms, eight hydrogen atoms, and four oxygen atoms, which amounts to 180.15 amu ... Although this represents just a tiny fraction of 1 mole of water (~18 g), it contains more water molecules than can be clearly imagined. ...High-weight hyaluronan molecules deliver immediate intensive hydration to the surface layers of the skin for an instant smoothing and firming effect." You might remember that our skin actually ...The molecular weight of dry air is approximately 28.97 grams per mole (g/mol). This value is calculated by considering the molecular weights and relative proportions of nitrogen, oxygen, carbon dioxide, and other trace gases in air. ... 10.332 Meters of Water; 406.78 Inches of Water; 33.899 Feet of Water; 14.696 Pound-Force …a cork ring. Measure the temperature of the water inside the flask. Look up the density of the water (use the Density of Water Table in Appendix VI at the end of this book). Calculate the volume of the flask using the density formula. 7. Calculate the gram-molecular weight of the unknown liquid.Likewise, the molecular mass of an aspirin molecule, C 9 H 8 O 4, is the sum of the atomic masses of nine carbon atoms, eight hydrogen atoms, and four oxygen atoms, which amounts to 180.15 amu ... Although this represents just a tiny fraction of 1 mole of water (~18 g), it contains more water molecules than can be clearly imagined. ...The surface tension of water (72.8 mN/m at room temperature) is much higher than any other liquid of similar molecular weight. Water has, moreover, a very high solubility parameter but also a very low co-volume and free volume, considering the size of …Oct 9, 2019 ... Science · Chemistry · Chemistry questions and answers · Water (H20) with a molecular weight of 18 has a boiling point of 100°C and methane (CH)...For example, the molecular mass of water, which has two atoms of hydrogen and one atom of oxygen, is 18 (i.e., 2 + 16). Also called molecular weight. Search ...For example, the molecular weight of water is 18.015 grams per mole. This gives us the two ratios shown in the image below, which we can use to convert between ...Since hexane is nonpolar, it is miscible with CCl 4, and so both form a single layer below the water. Example 10.19.1 10.19. 1: Solubility in Water. Predict which of the following compounds will be most soluble in water: CH3CH2OHEthanol CH 3 CH 2 OH Ethanol. CH3CH2CH2CH2CH2CH2OHHexanol CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 OH …Specific gravity (also referred to as relative density) is the ratio of the density of a material compared to the density of water at 4\ \mathrm {\degree C} 4 °C ( 39.2\ \mathrm {\degree F} 39.2 °F ). People usually choose that temperature as it is when water is at its densest. The specific gravity equation is: Since the specific gravity ...Sep 9, 2023 · The molecular mass of water is 18 atomic mass units (amu). Significance of the Molecular Mass of Water. The molecular mass of water is a critical concept in chemistry and has several significant implications: 1. Stoichiometry: In chemical reactions, the molecular mass of water is essential for stoichiometric calculations. It helps determine the ... Many other calculations require conversion into moles. These include consumption of pH adjustment chemicals for RO feedwater, solubilities of scale forming ...Question: The equilibrium between liquid water and water vapor in a steam boiler at moderate pressures and temperatures can be described by two equations: the ideal gas law: PV=MWmR(T+273.15) and the Antoine equation for vapor pressure: log10P=A−T+CB where P= pressure in Pa,V= the volume of the vapor space in m3,m= the mass of the vapor in …In this study, the interaction parameter was correlated to the number average molecular weight and it was approximated that carbohydrate polymers with a number average molecular weight higher than 3,600 g/mol have the same value of the interaction parameter χ i of 1.02. For multicomponent systems, the Flory-Huggins equation can be …NaCl molecular weight. Molar mass of NaCl = 58.44277 g/mol. This compound is also known as Sodium Chloride. Convert grams NaCl to moles. or. moles NaCl to grams. Molecular weight calculation: 22.98977 + 35.453. Percent composition by element. Element: Sodium Symbol: Na Atomic Mass: 22.989770 # of Atoms: 1About Water. 1 000 kilograms [kg] of Water fit into 1 cubic meter. 62.42796 pounds [lbs] of Water fit into 1 cubic foot. Water weighs 1 gram per cubic centimeter or 1 000 kilogram per cubic meter, i.e. density of water is equal to 1 000 kg/m³; at 25°C (77°F or 298.15K) at standard atmospheric pressure . In Imperial or US customary ...Water is a relatively "light" molecule with a molar mass (molecular weight) of 18.01, giving the vapor a density of 0.623 relative to air. The high dielectric constant of water is largely responsible for its good solvent properties.It is, however, a weak electrolyte when pure, but with dissolved ions increases its conductivity by several orders of magnitude.The lack of DBPs with a molecular weight of >465 Da may reflect the fact that higher-molecular-weight precursors are preferentially removed before disinfection 10,95, or the lack of bromide and ...Dumbbells and kettlebells may still be hard to come by, but containers of water are widely available and nearly free. The trick is finding something that’s the right weight, withou...Q. (a) Calculate the relative molecular mass of water (H2O). (b) Calculate the molecular mass of HNO3. Q. Calculate the gram molecular mass of water from the values of gram atomic mass of Hydrogen and of Oxygen. Gram atomic mass of Hydrogen =1 g. Gram atomic mass of Oxygen =16 g. Q. Calculate the molecular mass of CH3OH.The molecular weight of Water [H 2 O] is 18.0154.. Water (H2O) is an inorganic compound of four elements: Hydrogen and Oxygen. The molecular weight of Water is 18.0154 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements. Likewise, the molecular mass of an aspirin molecule, C 9 H 8 O 4, is the sum of the atomic masses of nine carbon atoms, eight hydrogen atoms, and four oxygen atoms, which amounts to 180.15 amu ... Although this represents just a tiny fraction of 1 mole of water (~18 g), it contains more water molecules than can be clearly imagined. ...May 15, 2022 · Molecular Weight. The weight of a molecule is the sum of the weights of the atoms of which it is made. The unit of weight is the dalton, one-twelfth the weight of an atom of 12 C. Thus the molecular weight (MW) of water is 18 daltons. In this study, the interaction parameter was correlated to the number average molecular weight and it was approximated that carbohydrate polymers with a number average molecular weight higher than 3,600 g/mol have the same value of the interaction parameter χ i of 1.02. For multicomponent systems, the Flory-Huggins equation can be …For hydrogen, the atomic weight is 1.00794, and for oxygen it is 15.9994. Since there are 2 hydrogens in the molecule, the total weight of hydrogen in water is 2 times 1.00794, or 2.01588. There is only 1 oxygen, so the total weight of oxygen is 15.9994. Finally, we add up the weights of all the atoms to get the total molecular weight of water ... It is a conjugate acid of a hydroxide. ChEBI. Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. The Molecular Composition of Cells. Cells are composed of water, inorganic ions, and carbon-containing (organic) molecules. Water is the most abundant molecule in cells, accounting for 70% or more of total cell mass. Consequently, the interactions between water and the other constituents of cells are of central importance in biological chemistry.Molecular weight of petrol is so much higher than water, but when it comes to physical property, weight, one litre of water weighs more than one litre of petrol ... Another approach to answer this for youself might be to run with the idea and look at molecules with even higher molecular weight. Like, why aren't plastics far heavier ...Sample Molecular Weight Calculation. The chemical formula for water is H2O, which means this molecule has 3 atoms: 2 of hydrogen (H) and 1 oxygen (O) atom. Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen's is 16. In order to calculate the molecular weight of one water ... (a) Atomic mass of hydrogen = 1u, oxygen = 16 u So the molecular mass of water, which contains two atoms of hydrogen and one atom of oxygen is = 2 × 1+ 1×16 ...... ... VaCNT membranes also enable good separation and selective transport of solute molecules and ions 37,39 . ... ... nm) is reported and compared with ...Physics questions and answers. 107 grams of liquid water are in a cylinder with a piston maintaining 1 atm (101325 Pa) of pressure. It is exactly at the boiling point of water, 373.15 K. We then add heat to boil the water, converting it all to vapor. The molecular weight of water is 18 g/mol and the latent heat of vaporization is 2260 J/g.The molecular weight can be obtained from the molecular formula, data tables, or the label on the bottle containing the chemical of interest. Molar solution concentration calculator. Each calculator cell shown below corresponds to a term in the formula presented above. Enter appropriate values in all cells except the one you wish to …Water has a molarity of 55.5 M. 1 liter of water weighs 1000 g, and, as molarity is the number of moles per liter; finding the molarity of water is the same as …Dec 20, 2019 ... TMS cloud water were linked with natural biogenic emissions and biomass burning. δ13C values of C6 and Ph were lower than those in Gosan and ...If $\pu{2.600 g}$ of a weak diprotic acid were dissolved in $\pu{100 mL}$ of distilled water and a $\pu{10 mL}$ aliquot of this solution required $\mathrm{21.60\ mL}$ of $\mathrm{0.1000\ M\ NaOH}$ to . ... Calculating molecular weight of an acid based on titration data. Ask Question Asked 8 years, 5 months ago. Modified 6 years ago.Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Definitions. ... For example, water is H 2 O, meaning it contains two hydrogen atoms and one oxygen atom. Find atomic masses: look up the atomic masses of each element present in the compound. The atomic mass is usually found on the periodic table and is given in atomic mass ...The Molecular Composition of Cells. Cells are composed of water, inorganic ions, and carbon-containing (organic) molecules. Water is the most abundant molecule in cells, accounting for 70% or more of total cell mass. Consequently, the interactions between water and the other constituents of cells are of central importance in biological chemistry.Anne Marie Helmenstine, Ph.D. Updated on November 28, 2022. The molecular formula for water is H 2 O. One molecule of water consists of one oxygen atom covalently bonded to two hydrogen atoms. The same formula is also the simplest formula for water, since the subscripts don't reduce to smaller values. There are three isotopes of …Glycerol has 3 carbon atoms, 8 hydrogen atoms, and 3 oxygen atoms. It has a molecular weight of 92.09 g/mol and its IUPAC name is 1, 2, 3- Propanetriol or 1, 2, 3- Trihydroxypropane. The chemical and molecular formula for glycerol (glycerine) is given as-. Chemical Formula of Glycerol. C 3 H 8 O 3.It is useful to know the percent of water contained within a hydrate. The sample problem below demonstrates the procedure. Example 10.11.1 10.11. 1: Percent of Water in a Hydrate. Find the percent water in cobalt (II) chloride hexahydrate, CoCl2 ⋅ 6H2O CoCl 2 ⋅ …Jan 10, 2020 · Calculate the weight of water using the relationship between mass, density and volume, as well as noting the technical difference between mass and weight. To calculate the mass of water, multiply the volume of the water by the known density of water. Convert to a weight by multiplying by 9.81 m/s^2. When we consider the behavior of gases in Unit 5, we can use the data to calculate the molecular weight of each gas. This method was, until the invention of the mass spectrometer, the best way of measuring molecular weights of gas molecules . ... For example, 1 mol of water (H 2 O) has 2 mol of hydrogen atoms and 1 mol of oxygen atoms.General. The solid state of water is known as ice; the gaseous state is known as water vapor (or steam).The units of temperature (formerly the degree Celsius and now the Kelvin) are defined in terms of the triple point of water, 273.16 K (0.01 °C) and 611.2 Pa, the temperature and pressure at which solid, liquid, and gaseous water coexist in equilibrium.The molar mass/molecular weight is actually the sum of the total mass in grams of the atoms present to make up a molecule per mole. The unit of molar mass is grams/mole. ... For example, one mole of water molecules contains 6.022140758 x 10 23 molecules. Q3 . What is the use of the mole concept?Whether it's alcohol or soft drink, drinking too much of anything other than water can play havoc with your weight. Trick yourself into drinking less by using taller, narrower glas...Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound.The water molecule forms an angle, with hydrogen atoms at the tips and oxygen at the vertex. Since oxygen has a higher electronegativity than hydrogen, the side of the molecule with the oxygen atom has a partial negative charge. ... (H 2 S) does not have hydrogen bonds, and though it has twice the molecular weight of water, it is a gas at room ...Learn how to calculate the weight and volume of a mole of water using Avogadro's number and the atomic weights of hydrogen and oxygen. Find out that one …For example, water has a relative molecular mass of 18.0153 (3), but individual water molecules have molecular masses which range between 18.010 564 6863 (15) Da ( 1 H. …Aug 9, 2012 ... Therefore, one mole of water has a mass of 18.01528 grams. However, the exact mass of hydrogen-1 (the most common hydrogen isotope) is 1.00783, ...Water density at room temperature: 0.99802 g/ml. Convert your 1L figure to mL. Volume = 1 × 1000 = 1000mL. Weight in grams = volume × density. 1000 × 0.99802 = 998.02g. Convert grams to pounds. 998.02 × 0.0022 = 2.1956 lb. To make things easier, and assuming you require a rough estimate, you could use a straight density figure of 1g/ml. 1. Introduction. Water-soluble organic matter (WSOM) is an important chemical component of organic aerosol (OA), accounting for up to 80% of the OA mass (Matos et al., 2015).Water-soluble organic matter is ubiquitous in rural, urban, and marine aerosols, and plays a significant role in cloud droplet formation and atmospheric aqueous …Learn how to write the molecular formula for water, H 2 O, which shows one oxygen atom and two hydrogen atoms. Find out the isotopes of hydrogen, the other …Many other calculations require conversion into moles. These include consumption of pH adjustment chemicals for RO feedwater, solubilities of scale forming ...The molecular weight distribution is the relationship between the relative content of each molecular weight close fractions in the homopolymer homologue and the molecular weight. ... Quaternary ammonium electrolytes and their solutions in water and molecular solvents. Molecules. 2018; 23:511. doi: 10.3390/molecules23030511.This application calculates MW for any chemical formula such as H2O, CaCO3 …. It has a built-in case correction so you could write h2o when you mean H2O It also can calculate the MW for multi-section formula NaBO3 . 4H2O. please try to leave feedback on the above link of. Molar Mass of Water: H2O / Molecular Weight Calculator.We can use the rearranged molarity equation to calculate the moles of NaCl needed for the specified concentration and volume: mol NaCl = [ NaCl] × L of solution = 0.800 mol L × 0.250 L = 0.200 mol NaCl. We can then use the molecular weight of sodium chloride, 58.44 g mol , to convert from moles to grams of NaCl :The mean molecular weight of pure water over the range 0–40 °C is 86.1–80.7 and 89.4–84.5 for seawater. Warming of water increases the kinetic energy of the molecules and induces breaking of hydrogen bonds (8.364 kJ/mol); both effects increase the volume of the fluid.Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound.Feb 6, 2021 ... Hello geniuses, in this video you will learn to find the molar mass of water(H2O). The concept of molar mass is very important for the ...b) Similarly, for H 2 O, the molecular weight is 18.02 (16.00 for O and 2.02 for 2 H), and so. MH2O = mH2O nH2O = 18.02 g mol−1 M H 2 O = m H 2 O n H 2 O = 18 .02 g mol − 1. The molar mass is numerically the same as the atomic or molecular weight, but it has units of grams per mole. (a) Atomic mass of hydrogen = 1u, oxygen = 16 u So the molecular mass of water, which contains two atoms of hydrogen and one atom of oxygen is = 2 × 1+ 1×16 ...See full list on convertunits.com Water. Water. Formula: H 2 O. Molecular weight: 18.0153. IUPAC Standard InChI:InChI=1S/H2O/h1H2 Copy. IUPAC Standard InChIKey:XLYOFNOQVPJJNP-UHFFFAOYSA-N Copy. CAS Registry Number: 7732-18-5. Chemical structure: This structure is also available as a 2d Mol file or as a computed 3d SD file The 3d structure may be viewed using Java or Javascript ... The water molecule forms an angle, with hydrogen atoms at the tips and oxygen at the vertex. Since oxygen has a higher electronegativity than hydrogen, the side of the molecule with the oxygen atom has a partial negative charge. ... (H 2 S) does not have hydrogen bonds, and though it has twice the molecular weight of water, it is a gas at room ...Jun 1, 2018 · Explanation of how to find the molar mass of H2O: Water.A few things to consider when finding the molar mass for H2O:- make sure you have the correct chemica... For hydrogen, the atomic weight is 1.00794, and for oxygen it is 15.9994. Since there are 2 hydrogens in the molecule, the total weight of hydrogen in water is 2 times 1.00794, or 2.01588. There is only 1 oxygen, so the total weight of oxygen is 15.9994. Finally, we add up the weights of all the atoms to get the total molecular weight of water ... To calculate the percent composition, the masses of C, H, and O in a known mass of C 9 H 8 O 4 are needed. It is convenient to consider 1 mol of C 9 H 8 O 4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements: % C = 9 mol C × molar mass C molar mass C 9 H 8 O 4 × ...3.4 Molecular polarity. 3.5 Hydrogen bonding. 3.6 Self-ionization. 3.7 Electrical conductivity and electrolysis. 3.8 Mechanical properties. 3.9 Reactivity. ... On 7 April 1795, the gram was defined in France to be …Therefore, the molar mass of water becomes 18 g/mol. Molar mass of H2O. Molar Mass of CO2. The molar mass of CO2 is the total sum of atomic masses of the ...CaCl2 molecular weight. Molar mass of CaCl2 = 110.984 g/mol. This compound is also known as Calcium Chloride. Convert grams CaCl2 to moles. or. moles CaCl2 to grams.May 15, 2022 · Molecular Weight. The weight of a molecule is the sum of the weights of the atoms of which it is made. The unit of weight is the dalton, one-twelfth the weight of an atom of 12 C. Thus the molecular weight (MW) of water is 18 daltons.
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Jul 29, 2021 · molecular mass of ethanol = 62.068 amu. The molar mass of ethylene glycol is 62.068 g/mol. B The number of moles of ethylene glycol present in 35.00 g can be calculated by dividing the mass (in grams) by the molar mass (in grams per mole): 35.00gethyleneglycol(1molethyleneglycol ( g)) 62.068gethyleneglycol) = 0.5639molethyleneglycol. Water has a molarity of 55.5 M. 1 liter of water weighs 1000 g, and, as molarity is the number of moles per liter; finding the molarity of water is the same as …We can use the rearranged molarity equation to calculate the moles of NaCl needed for the specified concentration and volume: mol NaCl = [ NaCl] × L of solution = 0.800 mol L × 0.250 L = 0.200 mol NaCl. We can then use the molecular weight of sodium chloride, 58.44 g mol , to convert from moles to grams of NaCl :Molecular Weight. Molecules are composed of several atoms, for example a carbon dioxide molecule (CO 2) is made up of 1 carbon atom and 2 oxygen atoms.The molecular weight (or molecular mass or relative molecular mass (RMM)) is the sum of the atomic weights of all the atoms in the molecule.. Example 1. Calculate the molecular weight of carbon …Q. (a) Calculate the relative molecular mass of water (H2O). (b) Calculate the molecular mass of HNO3. Q. Calculate the gram molecular mass of water from the values of gram atomic mass of Hydrogen and of Oxygen. Gram atomic mass of Hydrogen =1 g. Gram atomic mass of Oxygen =16 g. Q. Calculate the molecular mass of CH3OH. Therefore, the molar mass of water becomes 18 g/mol. Molar mass of H2O. Molar Mass of CO2. The molar mass of CO2 is the total sum of atomic masses of the ...Q 4. The molecular mass of nicotine is 162g/mol. It contains 74% carbon, 8.7% hydrogen and 17.3% nitrogen. Determine nicotine's empirical and molecular formula. View Solution. Q 5. Molecular mass of water ______. View Solution. Click here:point_up_2:to get an answer to your question :writing_hand:determine the molecular mass of water.Water is the chemical substance with chemical formula H 2 O; one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Water is a tasteless, odorless liquid at ambient temperature and pressure. Liquid water has weak absorption bands at wavelengths of around 750 nm which cause it to appear to have a blue color. Jul 10, 2022 · Our molecular weight calculator allows you to insert up to six different elements. You can choose the number of atoms of each species in your formula. 🙋 The atoms of six different species (oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus) make up more than 99.95\% 99.95% of all the atoms in a human body! Sep 9, 2023 · The molecular mass of water is 18 atomic mass units (amu). Significance of the Molecular Mass of Water. The molecular mass of water is a critical concept in chemistry and has several significant implications: 1. Stoichiometry: In chemical reactions, the molecular mass of water is essential for stoichiometric calculations. It helps determine the ... borax molecular weight. Molar mass of Na2B4O7.10H2O = 381.37214 g/mol. Convert grams borax to moles. or. moles borax to grams. Molecular weight calculation:This was calculated by multiplying the atomic weight of hydrogen (1.008) by two and adding the result to the weight for one oxygen (15.999). Please remember ....