Chemistry pls helpppp

Question

How many liters of hydrofluoric acid are produced if 4.00 g of hydrogen gas is reacted with excess fluorine gas at STP?

H₂ +  F₂  --->  HF

Answer 1

H₂ +  F₂  --->  2HF .. balanced equation

molar mass H₂ = 2 g / mol

4.00 g H₂ x 1 mol H2 / 2 g = 2 mols H2

2 mols H₂ x 2 mol HF / 1 mol H₂ = 4 mols HF formed from 2 mols H₂

At STP, 1 mole of an ideal gas = 22.4 L

2 mols H₂ x 22.4 L / mole = 44.8 L