How many grams of zinc metal are required to produce 2.00 liters of hydrogen gas at STP according to the chemical equation shown below?

Question

Quizplus · Accepted Answer

According to the balanced chemical equation:
Zn + 2 HCl → ZnCl2 + H2
1 mole of zinc reacts with 2 moles of hydrochloric acid, and produces 1 mole of hydrogen gas. At STP 1 mole of any gas occupies 22.4 liters of volume. Therefore, the number of moles of hydrogen gas produced is:
2.00 L / 22.4 L/mol = 0.0893 mol
This means that 0.0893 mol of zinc is required to produce this amount of hydrogen gas. The molar mass of zinc is 65.38 g/mol. Therefore, the mass of zinc required is:
0.0893 mol x 65.38 g/mol = 5.83 g
The correct choice is B.

How Many Grams of Zinc Metal Are Required to Produce