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Hydrogen sulfide, H2S has a molar mass of  34.08088g/mol.
Problem #1: What is the mass of one molecule of H 2 O? Step #1 - the molar mass of water is 18.015 g/mol. 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 that you need the molar mass first when trying to find the mass of one molecule. Step #2 - divide the substance's molar mass by Avogadro's Number. 18.015 grams/mol Ã· 6.022 x 10 23 molÂ¯ 1 = 2.992 x 10Â¯ 23 grams