What is the molecular mass of nitrogen gas (N₂) if 11.2 dm³ of gas at STP equals 1 mole?
Answer: 28 g
Explanation
At STP, 1 mole of any gas occupies 22.4 dm³.
If 11.2 dm³ = 0.5 mole →
0.5 mole of nitrogen (N₂) = 14 g
→ Full mole = 28 g (molecular mass of N₂)
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