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1 November, 20:08

A lightbulb filled with argon gas has a volume of 75 mL at STP. How many moles of argon gas does the lightbulb contain?

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  1. 1 November, 22:47
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    0.00335 moles

    Explanation:

    From the question, Using

    PV = nRT ... Equation 1

    Where P = pressure, V = Volume, n = number of moles of argon gas, R = Molar gas constant, T = Temperature.

    make n the subject of the equation

    n = PV/RT ... Equation 2

    Given: P = 1 atm (standard pressure), T = 273 K (standard temperature), V = 75 mL = 0.075 dm³

    Constant: R = 0.082 atm·dm³/K·mol

    Substitute into equation 2

    n = (1*0.075) / (273*0.082)

    n = 0.075/22.386

    n = 0.00335 moles
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