June 2017 NY Regents Chemistry Exam
19 At STP, which gaseous sample has the same number of molecules as 3.0 liters of N2(g)?
(1) 6.0 L of F2(g)
(2) 4.5 L of N2(g) (3) 3.0 L of H2(g)
(4) 1.5 L of Cl2(g)
Solution: Gases with the same pressure, temperature and volume have the same number of molecules. We are told that nitrogen has a volume of 3 liters in the given and we are looking for another gas with the same volume.
Answer:3
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