Which sample of gas at STP has the same number of molecules as 6 liters of Cl2(g) at STP?(1) 3 lite

January 2018 NY Regents Chemistry Exam

16 Which sample of gas at STP has the same number of molecules as 6 liters of Cl2(g) at STP?
(1) 3 liters of O2(g)

(2) 6 liters of N2(g)

(3) 3 moles of O2(g)

(4) 6 moles of N2(g)

Solution: Gases with the same pressure, temperature and volume have the same number of molecules. We see 6 liters of Cl2 in the given and are looking for another gas with the same volume.

Answer:2

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