If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?

The ideal gas law is PV = nRT, where P is pressure, V is volume, T is temperature, and n is the number of moles. If pressure, volume, and temperature are known, solve for the molar amount: n = PV/(RT). Therefore, the answer is the molar amount of the gas.

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