Answer to Question #166872 in General Chemistry for Greg

Question

Calculate the molality of a sucrose solution made by dissolving 67.9 grams sucrose into 94.9 grams water. The molar mass of sucrose is 342.2 g/mol.

Answer 1

С (molality of sucrose) = n (sucrose)/m (water);

n (sucrose) = m/M = 67.9/342.2 = 0.2 mole;

С (molality of sucrose) = 0.2 mole/94.9 = 0.0021 mole/kg.

Answer: C = 0.0021 mole/kg.