Question

Convert 12 g of oxygen gas into moles.

Answer 1

Gram molecular mass of O₂ = 32 g
mass of oxygen gas given = 12 g
Therefore, 32 g of O₂ = 1 mole of O₂
So, 12 g of O₂ = $\frac{12}{32}$ moles of O₂
Hence, 12 g of oxygen contains 0.375 moles of oxygen.