If the pressure, volume, and the number of moles of a gas are known, which is needed to calculate the universal gas constant from the ideal gas law?
a)the temperature of the gas
b)the molar volume of the gas
c)the molar mass of the gas
d)the partial pressure of the gas

(A) because the pressure, volume and the number of moles are known so (B), (C), (D) are not the right answer so (A) must be the answer.

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c, liquids evaporate, creating a gas