Calculate the volume that 3.60 g H2 gas will occupy at STP.

Question

Calculate the volume that 3.60 g H2 gas will occupy at STP.

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Answer 1

At STP, we know that 1 mol of gas occupies 22.4 L. So now we need to calculate the moles of H2. Assuming the molar mass of H is 1 g/mol (which is very close), then H2 has a molar mass of 2 g/mol. So, to calculate the moles of H2, we take 3.6 g H2 / 2 g/mol of H2 = 1.8 mol H2. Now we have 1.8 mol H2 * 22.4 L/mol H2 = 40.32 L H2.