A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at 55 °C. The vapor pressure of pure water at 55 °C is 118.0 torr. The MW of lactose is 342.3 g/mol. What is the partial pressure of water above the

Question

A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at 55 °C. The vapor pressure of pure water at 55 °C is 118.0 torr. The MW of lactose is 342.3 g/mol. What is the partial pressure of water above the
solution?

A Person · Accepted Answer

The answer is 116.3 if you don't feel like plugging the numbers in.

DrBob222 · Answer

moles lactose = grams/molar mass moles H2O = moles/molar mass mole fraction H2O = moles H2O/total moles. P_soln = X_H2O*P^o_H2O

Anonymous · Answer

92.7

chantal · Answer

2.216