SAT Subject Physics Practice Question 551: Answer and Explanation

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Question: 551

7. One mole of helium gas and one mole of neon gas are both at STP. Which of the following statements about the gases is correct?

A. Their pressure is the same.
B. Their temperature is the same.
C. Their volume is the same.
D. Their number of particles is the same.
E. The pressure, temperature, volume, and number of particles is the same.

Correct Answer: E


The correct answer is (E). At STP the molar volume of any gas is 22.4 L. Standard pressure and volume are also the same for all gases, and of course a mole of any substance is the same number of particles.

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