How many grams of hydrogen are in 25.0 L of hydrogen gas at STP?

Question

Using Gas Laws.

what equation should i use? hydrogen weighs about 1 g per mole but idk where to go from there

Answer 1

Hydrogen has a mass of 2.016 g/mol.
At STP 1 mol occupies 22.4 L
Using the ratio
x/25 = 2.016/22.4
x = 25.2/11.2 ≈ 2.25 g

Answer 2

ok so. you know at STP you have 22.4 L/ mol. So you have 25 L hydrogen. So ..,. 25 L x 1 mol/ 22.4 L= 1.11 moles of hydrogen x 1.00794 g/ 1 mole of hyfrogen = 1.124 g of hydrogen