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21 August, 22:32

A rigid tank contains 1.80 moles of helium, which can be treated as an ideal gas, at a pressure of 27.3 atm. While the tank and gas maintain a constant volume and temperature, a number of moles are removed from the tank, reducing the pressure to 5.20 atm. How many moles are removed?

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  1. 22 August, 00:15
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    Has been removed 1.458 moles.

    Explanation:

    n1 = 1.8 mol

    p1 = 27.3 atm

    p2 = 5.2 atm

    n2=?

    n2 = n1 * p2/p1

    n2 = 0.342 moles

    Δn = n1-n2

    Δn = 1.458 moles
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