The volumes of four samples of gaseous compounds at 298 K and 101.3 kPa are shown in the table below

August 2019 NY Regents Chemistry Exam

40 The volumes of four samples of gaseous compounds at 298 K and 101.3 kPa are shown in the table below.

Which two samples contain the same number of molecules?

(1) 1 and 2

(2) 1 and 3

(3) 2 and 3

(4) 2 and 4

Solution: Gases with the same pressure, temperature and volume have the same number of molecules.

Answer:2

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