16 At STP, which sample contains the same number of molecules as 44 liters of NO2(g) at STP?

Regents Chemistry Exam January 2025 Question 16

16 At STP, which sample contains the same number of molecules as 44 liters of NO2(g) at STP?

(1) 22 L of CO2(g) (3) 66 L of O2(g)

(2) 44 L of O2(g) (4) 88 L of O2(g)

Solution:

Gases with the same pressure, temperature and volume have the same number of molecules. STP stands for standard temperature and pressure. We see 44 liters of NO2 in the given and are looking for another gas with the same volume. Choice 2 is the correct answer.

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