Question

calculate the molality of a solution that contains 51.2g of naphthalene in 500ml of carbon tetrachloride. the densityof CCl4 is 1.60g/ml

Answer 1

Explanation:

molality is a moles of solute per kg of solvent

moles of solute=51.2 g ×1

mole/128g = 1.18 moles naphthalene (molar mass of C10H8 =128 g/mole)

kg of solvent = 500 ml × 1.60 g/ml = 800 g = 0.800 kg molality (m) = 1.18 mole/0.800 kg = 1.48 moles.

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