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    question - sample gas at STP

    A 1.50L sample gas at STP has a mass of 4.75g. What is one possible formula of the gas? The possible answers are NCl3, SO2, NHF2, N2F2, NF3. I figured the denisty, 4.75 divided by 1.50L = 3.16 density Then I am figuring the density of each possible answer. for instance, for NCL3, I have...