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1 May, 12:52

How do you calculate the volume of a gas at STP given the number of moles of gas present

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  1. 1 May, 14:06
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    The Ideal Gas Law states that pressure (P) * volume (V) is equal to the # of moles (n) of the gas * a constant (R) * temperature (T), such that the equation is:

    PV = nRT

    At standard temp and pressure (STP), the T is 0°C or 273.15K, the P is 1 atm or 760 torr, and the R constant is 0.0821. Therefore the equation, solved for V becomes: V = nRT/P, or V = n (0.0821) (273) / 1, so that it reduces to V = 22.4 Liters, when n = 1 mole.

    So the V of any gas at STP is 22.4 L / mole
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