August 2019 NY Regents Chemistry Exam
15 At STP, a 50.-gram sample of H2O(l) and a 100.-gram sample of H2O(l) have (1) the same chemical properties
(2) the same volume (3) different temperatures (4) different empirical formulas
Solution: STP stands for standard temperature and pressure. Since both samples are at STP they would have the same temperature, eliminating choice 3. Both samples are of the same compound, H2O (l). Therefore, they should have the same chemical properties. Since their masses are different, the volumes would be different as well, eliminating choice 2. Finally, they would have the same empirical formula: H2O, eliminating choice 4.
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