import CoolProp.CoolProp as CP
CP.PropsSI('P','T',373,'Q',0,"INCOMP::LiBr[0.6]")
amm = lambda(x):'REFPROP::water[{}]&ammonia[{}]'.format(1-x,x)
f1 = amm(0.302385)
print f1

REFPROP::water[0.697615]&ammonia[0.302385]

print CP.PropsSI('D','T',300,'P',101325,f1)

892.694193402

print CP.PropsSI('C','T',300,'P',101325,'INCOMP::LiBr[0.23]')

3101.4363823

Psat = CP.PropsSI('P','T',300,'Q',0,'INCOMP::LiBr[0.23]')
print Psat

2951.14613672