Question

4 moles of Zinc reacted with an excess of hydrochloric acid. Calculate the grams, moles,and liters at stp of gas made.Please help!!!!!!!!
Zn + 2HCl ==> H2 + ZnCl2
mols Zn = 4 from the problem.
Using the coefficients in the balanced equation, convert mols Zn to mols H2.
That's 4 mols Zn x (1 mol H2/1 mol Zn) = 4 mols H2.

1 mol H2 occupies 22.4 L at STP; therefore, 4 mols will occupy 4 mols x 22.4 L/mol = ?

grams = mols x molar mass = ?

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