MCAT General Chemistry Question 117: Answer and Explanation

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Question: 117

12. A gas at a temperature of 27°C has a volume of 60.0 mL. What temperature change is needed to increase this gas to a volume of 90.0 mL?

  • A. A reduction of 150°C
  • B. An increase of 150°C
  • C. A reduction of 40.5°C
  • D. An increase of 40.5°C

Correct Answer: B

Explanation:

We will use Charles's law. First, we must convert the temperature to kelvins by adding 273 to get 300 K as the initial temperature. Think of this as a proportionality: If the volume is multiplied by the temperature will also have to be multiplied by Thus the final temperature is 450 K, which represents a 150 K increase.

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