The Coolant in Automobiles Is Often a 50/50 % by Volume

question 52

Multiple Choice

The coolant in automobiles is often a 50/50 % by volume mixture of ethylene glycol,HOCH₂CH₂OH,and water.At 20°C,the density of ethylene glycol is 1.1088 g/mL and the density of water is 0.9982 g/mL.Assuming that the volumes are additive,what is the expected freezing point of a 50/50(v/v) % ethylene glycol/water solution? K_f = 1.86°C/m for water.

• A)-16°C
• B)-17°C
• C)-30°C
• D)-33°C

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