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What is the mass of 1.2 grams of oxygen if it occupies a volume of 500 cubic centimeters at s.t.p?
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If the mass is 1.2 grams wouldn't it have a mass of 1.2 grams regardless of how much volume it occupies at STP (or any other set of conditions). Incidentally, I don't think 1.2 g oxygen will occupy 500 cc at STP.
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