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Teniendo en cuenta que la masa molar del H2 es de 2 gramos y que 1 mol de H2 es igual a su masa molar:
1 mol ------- 2 gramos
x moles --- 45 gramos
x = 45 ÷ 2 -> x = 22'5 moles.
P×V = R×n×T
1 × V = 0'082 × 22'5 × 450
V = 830'25 L