A Solution Is Prepared by Mixing 45 $\circ$ C?

A)1

A solution is prepared by mixing 45.68 g of carbon disulfide (CS₂,76.13 g/mol) with 16.42 g of acetonitrile (CH₃CN,41.06 g/mol) .What is the mole fraction of CS₂ in the vapor phase at 25 ^$\circ$ C?

A) 1.00
B) 0.600
C) 0.167
D) 0.273
E) 0.857