Practice Quiz

Praxis II General Science

Category - Major Ideas

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A new gas has been found that has a volume of 22.4 liters at room temperature and atmospheric pressure. Which of the following is needed to determine the molecular weight of this gas?
  1. The density of the gas
  2. The ideal gas constant
  3. The exact temperature
  4. The polarity of the gas
  5. We do not have enough information to determine the molecular weight of the gas.
Explanation
Answer: A - Given the volume at STP (standard temperature and pressure), we know that we have 1 mole of the gas. This can be found using the ideal gas law. 1 mole of gas at room temperature and 1 atmosphere occupies just about 22.4 liters. Thus, if we know the density as well, then the molecular weight can easily be determined.
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