## Chemistry and Chemical Reactivity (9th Edition)

Number of moles of silicon: $2.25\ g\div 28.085\ g/mol=0.08\ mol$ Number of moles of $CH_3Cl$ $n=PV/RT$ $n=0.206\ mol$ Since this is greater than $2×0.08\ mol$, $CH_3Cl$ is in excess. Mass produced: $0.08\ mol×129.06\ g/mol=10.34\ g$ Partial pressure at the final temperature: $P_x=n_xRT/V$ $P_x=0.08\ mol×0.082057\ L.atm/mol.K×368\ K\div 6.56\ L$ $P_x=0.0369\ atm$