AP Chemistry Unit 3 Practice Test 2026 Properties Of Substances And Mixtures

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At STP a 5.00 L flask filled with air has a mass of 543.251 g. The air in the flask is replaced with another gas, and the mass of the flask is then determined to be 566.107 g. The density of air is 1.290 g L −1 . What is the gas that replaced the air?

Only a small fraction of all molecules of this substance has enough kinetic energy to escape into the gas phase. large volume, increased temperature When the vapor is condensed, the liquid burns easily. Xe

Correct Answer:

Explanation:

Correct answer: Xe

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