None if you don't put it with something that will produce H2. I assume it is an acid. 1 mol Zn will produce 1 mole H2.
25.0 g Zn = ?? moles.
moles = grams/molar mass. Then substitute moles Zn you found for n in PV = nRT. Don't forget to use Kelvin for T.
When 25.0 g of Zn reacts, how many L of H2 gas are formed at 25 °C and a pressure of 854 mmHg?
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