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26 March, 10:03

The table below shows a comparison of the different gas laws. Some cells have been left blank.

Name Variables Constants Equation Boyle's law Pressure, volume? PV = k Charles's law Volume, temperature? V = kT? Temperature, pressure Volume, moles of gas P = kT? Pressure, temperature, volume?

Which are assumed to be constant while using the combined gas law?

1. pressure

2. number of moles

3. volume and moles of gas

4. pressure and temperature

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Answers (1)
  1. 26 March, 10:48
    0
    The combined gas equation relates three variables pressure, temperature and volume when the number of moles is constant.

    The equation is PV / T = constant. Which is valid for a fixed number of moles of the gas.

    You can derive the combined gas equation from the combination of Bolye's law, Charles' law and Gay-Lussac's law, which needs some algebra.

    Answer: option 2. number of moles.
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