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PV = nRT n = PV/RT @ STP T= 0+273k; P = 1atm R = 0.821 L- atm/mol-K n = 1atm(56.2L)/0.821 L- atm/mol-K(273k) n = 2.50 mole 2.50 moles of Ar =39.984g of Ar/1mole of Ar

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