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Peso molecular del CO2= 12 + (16x2)= 44 gr/mol
Entonces: Número de moles= masa/peso molecular
n= 7.31gr/44gr/mol = 0.1661 mol
T= 29°C + 273°K = 302 °K
P= 720 mmHg = 0.947 atm
R= 0.0802 L atm/mol °K
FÓRMULA
PV=nRT
V= nRT/P
V=(0.1661 mol *0.0802 L atm/ mol °K * 302°K)/0.947 atm
V= 4.24 L