150 mL of C 2 HOH (density 0.78 g / mL ) is diluted to 1 L by adding water. Molality of the solution is

Question

150 mL of C 2 HOH (density 0.78 g / mL ) is diluted to 1 L by adding water. Molality of the solution is (A) 2.54 (B) 1.17 (C) 2.99 (D) 29.9

Tardigrade Admin · Accepted Answer

150 mL C 2 H 5 OH =150 × 0.78 g =117.0 g =(117/46) mol Water =1000-150=850 g Molality =(117/46) × (1/850) × 1000=2.99

Q. $150 m L$ of $C_{2} H O H$ (density $0.78 g / m L$ ) is diluted to $1 L$ by adding water. Molality of the solution is