A sample of NH3 gas occupies 75.0 L at STP. How many hydrogen atoms are there?
Solution: We need to remember that at STP (standard temperature and pressure), 1 mol of gas occupies 22.4L.
75.0L ( 1mol/22.4L)(6.02*10^23 molecules of NH3/1mol NH3)(2H atoms/1 molecule NH3) = 4.03*10^24 atoms
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