Determine the vapor pressure of a solution at 55°c that contains 34.2 g nacl in 375 ml of water. the vapor pressure of pure water at 55°c is 118.1 torr. the van't hoff factor for nacl is 1.9 determine the vapor pressure of a solution at 55°c that contains 34.2 g nacl in 375 ml of water. the vapor pressure of pure water at 55°c is 118.1 torr. the van't hoff factor for nacl is 1.9 115 torr 92.8 torr 108 torr 87.1 torr 112 torr

Question

Chemistry

Johnathon Costa

5 December, 04:47

Determine the vapor pressure of a solution at 55°c that contains 34.2 g nacl in 375 ml of water. the vapor pressure of pure water at 55°c is 118.1 torr. the van't hoff factor for nacl is 1.9 determine the vapor pressure of a solution at 55°c that contains 34.2 g nacl in 375 ml of water. the vapor pressure of pure water at 55°c is 118.1 torr. the van't hoff factor for nacl is 1.9 115 torr 92.8 torr 108 torr 87.1 torr 112 torr

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Milton Cooke · Answer 1

Answer is: pressure is 112 torr.

n (NaCl) = 34,2 g : 58,5 g/mol.

n (NaCl) = 0,55 mol.

m (H₂O) = 369,37 g.

n (H₂O) = 369,37 g : 18 g/mol = 20,52 mol.

mol fraction (H₂O) = 20,52 mol : 21,7 mol = 0,95.

p = mol fraction (H₂O) · p (H₂O).

p = 0,997 · 118,1 torr.

p = 112 torr.