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4 September, 09:04

A helium balloon has a volume of 2.5 L. When heated to 343.5K the pressure of the gas is 66.7 kPa. How many moles of He gas would there be?

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  1. 4 September, 09:26
    0
    0.06mole

    Explanation:

    Given parameters:

    Volume of balloon = 2.5L

    T = 343.5K

    P = 66.7kPa; in atm gives = 0.66atm

    Unknown:

    Number of moles of He = ?

    Solution:

    To solve this problem, we use the ideal gas equation.

    It is mathematically expressed as;

    Pv = nRT

    where p is the pressure

    v is the volume

    n is the number of moles

    R is the gas constant

    T is the temperature

    0.66 x 2.5 = n x 0.082 x 343.5

    n = 0.06mole
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