A solution containing 62 g ethylene glycol in 250 g water is cooled to −10°C. If for water is 1.86 K kg mol⁻¹, the amount of water (in g) separated as ice is:

Question

A solution containing 62 g ethylene glycol in 250 g water is cooled to −10°C. If  for water is 1.86 K kg mol⁻¹, the amount of water (in g) separated as ice is:

Canvas Classes · Accepted Answer

Strategy:
 Find the molality required at -10°C, and then calculate how much water must be remaining to maintain that molality. The difference from the starting water mass gives the amount of ice.

Step 1: Calculate initial moles of ethylene glycol
- Molar Mass = 62.
- .

Step 2: Calculate required final molality ()
.

Step 3: Solve for remaining water ()

Step 4: Calculate mass of ice
.

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