Chapter 10 Gases and Their Properties - Study Questions - Page 403c: 39

See the answer below.

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: $5×0.3=1.49\ mol\ C_2HBrClF_3$