The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how has the pressure of the gas changed?

For a fixed amount of gas, the ideal gas law gives P = nRT/V, so pressure is proportional to temperature divided by volume. Doubling both the absolute temperature and the volume leaves their ratio unchanged: (2T)/(2V) = T/V. Therefore, the pressure has stayed the same, which is choice A.

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