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15 March, 16:32

What is the mass of 3.15 liters of N2 gas at STP?

2.86 grams

3.21 grams

3.94 grams

4.06 grams

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Answers (1)
  1. 15 March, 16:58
    0
    3.94 g

    Explanation:

    At STP, 1 mol of N₂ gas occupies a volume of 22.4 L at STP.

    molar mas of N₂ is 28 g/mol

    1 mol of N₂ has a mass of 28 g.

    a volume of 22.4 L is occupied by 28 g

    therefore 3.15 L of volume is occupied by - 28 g / 22.4 L x 3.15 L = 3.94 g

    the mass of 3.15 L of N₂ gas is - 3.94 g
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