The vapor pressure of pure methyl alcohol at 19?C is 90.0 torr and that of pure ethyl alcohol is 40.0 torr. Assume a mixture of methyl alcohol and ethyl alcohol is ideal. what is the vapor pressure at 19?C of ethyl alcohol in equilibrium with a solution prepared by mixing 1.9 moles of methyl alcohol (CH3OH) with 1.1 moles of ethyl alcohol (C2H5OH)?