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18 October, 09:47

A 41.1 g sample of solid CO2 (dry ice) is added to a container at a temperature of 100 K with a volume of 3.4 L. If the container is evacuated (all of the gas removed), sealed, and then allowed to warm to room temperature T = 298 K so that all of the solid CO2 is converted to a gas, what is the pressure inside the container?

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  1. 18 October, 11:13
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    The pressure inside the container is 6.7 atm

    Explanation:

    We have the ideal gas equation: P x V = n x R x T

    whereas, P (pressure, atm), V (volume, L), n (mole, mol), R (ideal gas constant, 0.082), T (temperature, Kelvin)

    Since the container is evacuated and then sealed, the volume of the body of gas is the volume of the container.

    So we can calculate the pressure by

    P = n x R x T / V

    where as,

    n = 41.1 g / 44 g/mol = 0.934 mol

    Hence P = 0.934 x 0.082 x 298 / 3.4 L = 6.7 atm
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