How to calculate the molar mass?

How do you calculate molar mass for 3H<subscript>2?

  • 3 moles of hydrogen gas? 1.01g/mol x 6? Would you include the coefficient in the calculation to find molar mass?

  • Answer:

    No, only sum together atoms in the actual molecule to get the molar mass. The subscripts tell you the number of each atom in the molecule. Hydrogen gas is H2, so its molar mass is (2 x 1.01 g/mol) = 2.02 g/mol The coefficients are there to tell you how many of each molecule are needed to react with the other molecules in an equation, they are not part of the formula of the molecule.

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