Calculate the mass of one molecule of H 2 ... One mole of water contains 6. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). Molecular weight calculation: 1.00794*2 + 15.9994 ›› … Enter the molecular formula of the molecule. 1. Ok, you must know that a water molecule has 2(1) + 16 = 18 protons and neutrons. Molar mass of H2O = 18.01528 g/mol. Convert grams Water to moles or moles Water to grams. As we know the molecular formula of water is H2O which means that one molecule of water contain 2 atoms of hydrogen and 1 atom of oxygen. Mass of one water molecule = 6. 0 2 3 × 1 0 2 3 water molecules. Thus, How to calculate the mass of a particular isotopic composition. Examples: C6H12O6, PO4H2(CH2)12CH3 Calculate molecular mass by: Contact email@example.com if you have any questions about this site To find the mass of 1.00×10 24 (a septillion) molecules of water, first we have to find the mass of one molecule of water (H 2 O). ›› Water molecular weight. The density of water is about 1 gram per milliliters (1 g/mL). It will calculate the total mass along with the elemental composition and mass of each element in the compound. We know that there are two hydrogen atoms and one oxygen atom for every H 2 0 molecule. Examples of molecular weight computations: CO2, SO2. The molecular formula of water is H_2O The atomic mass of H = 1 The atomic mass of O = 16 In a sense, the formula means H + H + O So... 1 + 1 + 16 = 18 Therefore, the mass of one mole of water = 18 Grams This program determines the molecular mass of a substance. Therefore, it follows that 1000 mL (one liter) of water will contain 1000 g of water molecules. (1 u is equal to 1/12 the mass of one atom of carbon-12) Examples: Fe, Au, Co, Br, C, O, N, F. Answer: i) Molecular mass of H 2 = 2 x Atomic mass of H = 2 x 1 = 2 u ii) Molecular mass of O 2 = 2 x Atomic mass of O = 2 x 16 = 32 u iii) Molecular mass of Cl 2 = 2 x Atomic mass of Cl = 2 x 35.5 = 71 u iv) Molecular mass of CO 2 = Atomic mass of C + 2 x Atomic mass of O = 12 + 2 x 16 Enter the molecular formula of the substance. And since the molar mass of water is 18 g per mol (18 g/mol), we can convert the 1000 g of water to moles of water by multiplying 1000 g of water by the ratio (1 mol/18 g). Definitions of molecular mass, molecular weight, molar mass and molar weight. The mass of one proton = mass of one neutron = 1.67 * 10^-24 grams, so the mass of 18 n+p = 18*1.67 * 10^-24 grams = 3*10^-23 grams Molecular Mass Calculator. 16 = 144 + 22 + 176 = 342 g 18 grams The mass of one mole of any atom/molecule is equal to its atomic molecular mass in grams. 12 + 22 + 11 . Use uppercase for the first character in the element and lowercase for the second character. 2. molecular mass of sucrose = 12 . 1 molecule of water = 18 g. No molecules = 18 g. 1molecule = 18 / No .