## Chemistry and Chemical Reactivity (9th Edition)

(Lines with * have a required answer) * Partial pressure of $CO_2$: $1.56-1.34=0.22\ atm$ Mol fraction of $CO_2$: $0.22/1.56×100\%=14.10\%$ Total number of moles: $n=1.56\ atm×0.55\ L/0.082/297\ K$ $n=0.0352\ mol$ Number of moles of oxygen: $0.0870\ g\div 32.0\ g/mol=0.00272\ mol$ Mol fraction of oxygen: $0.00272\ mol/0.0352\ mol×100\%=7.72\%$ * Partial pressure of oxygen: $7.72/100×1.56\ atm=0.12\ atm$ Mol fraction of CO: $100-14.10-7.72=78.18\%$ * Partial pressure of CO: $78.18/100×1.56\ atm=1.22\ atm$ * Mass of CO: $78.18/100×0.0352\ mol×28.01\ g/mol=0.771\ g$ * Mass of $CO_2$: $14.10/100×0.0352\ mol×44.01\ g/mol=0.218\ g$