Hepta-fluoropropane

The reaction of polyfluorinated alkenes with silver fluoride and hydrogen fluoride is another hydrofluorination method. Under certain conditions, perfluoroalkylsilvcr compounds can be isolated. For example, 11 % silver fluoride in acetonitrile reacts with hexafiuoropropene at 25 °C under nitrogen to yield a clear light-yellow solution of [tetrafluoro-l-(trifluoromethyl)-ethyl]silver. The addition of hydrogen chloride in acetonitrile at 0"C yields 1,1.1,2,3,3,3-hepta-fluoropropane. ... 

Calculate the vapour pressure (in Pa) at 20°C above an aerosol mixture consisting of 30% w/w of HFA 134a (tetrafluoroethane, molecular weight 102) with a vapour pressure of 68.4 psig and 70% w/w of HFA 227 (hepta-fluoropropane, molecular weight 170) with a vapour pressure of 56.0 psig. Assume ideal behaviour. 

---