Chemistry help! no need to tell me the answer, just show me how you do it?

Question

Chemistry help! no need to tell me the answer, just show me how you do it?

automotive air bags inflate when a sample of NaN3 is very rapidly decomposed. What mass of NaN3 is required to produce 375L of nitrogen gas at STP is produced?

Answer 1

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at STP 1 mole of N2 gas filles 22.4 (all gases actually, not just N2) So you have 375L - take 375/22.4 = 16.74 moles N2, which is 33.48 moles Nitrogen. NaN3 has 3 nitrogens per molecule, so you need 11.16 moles NaN3. MW NaN3 is 65 g per mole, so you need 11.16*65 = 725.4 g