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(PV/nT)1 = (PV/nT)2

(4.5 x 50)/(n x 273) = (1 x 22.4)/(1 x 273)

n = (4.5 x 50)/(22.4) = 10.04 moles

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Q: How many moles of oxygen must be placed in a container with a volume of 50 liters to produce pressure of 4.5 ATM at standard temperature?
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