Question

Calculate the number of molecules of oxygen gas that occupies a volume of 224 ml at 273 K and 3 atm pressure..... with steps plz?

Answer 1

Use PV=nRT and calculate n. n=PV/RT = (3 atm x 0.224 L )/(0.082 x L.atm/mol.K x 273K) = 0.03 moles. Then convert moles into number, using Avogadro’s number. 0.03 moles x 6x10^23 = 2x10^22 molecules. Note: the pressure measurement has one significant figure.

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