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A 20-cm-diameter cylinder that is 40 cm long contains 50 g of oxygen gas at 20C.

What is the number density of the oxygen? in m^-3
What is the reading of a pressure gauge attached to the tank? in kPa

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  1. p•V =m•R•T/μ,
    T= 293
    μ =32000
    p = m•R•T/V•μ
    Density = m/V = p•μ/R•T

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