The mass of a molecule of a substance is its molecular mass (m). molecular mass is measured in universal mass units (u). one universal mass unit (1 u) is approximately the mass of a proton. hydrogen gas has a molecular mass of 2.0158 u. a. type the formula "h2" into the reactants box. what is the molar mass of hydrogen gas, h2? b. what is the relationship between the molecular mass and the molar mass of a substance?
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