What is the experimental molar mass (that is, calculated from the data given and not taken from the periodic table) of magnesium if 0.0150 grams of magnesium generates 15.45 mL of hydrogen at 21.1 °C with a hydrogen partial pressure of 735.6 torr? Note that the partial pressure of water vapor has already been subtracted from the total pressure.     26.0 g/mol     20.5 g/mol     26.2 g/mol     23.4 g/mol     24.2 g/mol

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