## Chemistry and Chemical Reactivity (9th Edition)

a) From Dalton's law, that's the ratio of the partial pressures: $170\ mmHg/570\ mmHg=0.30$ b) Number of moles of oxygen: $160\ g\div 32.0\ g/mol=5.0\ mol$ From the ratio: $5×0.3=1.49\ mol\ C_2HBrClF_3$