## Chemistry and Chemical Reactivity (9th Edition)

Number of moles of $CO_2$ $12.0\ g\div 44.0\ g/mol=0.27\ mol$ a) Van der Waals equation: $\left[P+a\left(\dfrac nV\right)^2\right](V-bn)=nRT$ $(P+1.06\ atm)×0.488\ L=6.67\ L.atm$ $P=12.6\ atm$ Ideal gas: $PV=nRT$ $P=13.3\ atm$ Percent error: $(13.3-12.6)/12.6×100\%=5.56\%$ b) Van der Waals equation: $\left[P+a\left(\dfrac nV\right)^2\right](V-bn)=nRT$ $(P+1.06\ atm)×0.488\ L=4.54\ L.atm$ $P=8.23\ atm$ Ideal gas: $PV=nRT$ $P=9.08\ atm$ Percent error: $(9.08-8.23)/9.08×100\%=10.3\%$