Ethylene dichloride is an effective cooling agent when allowed to evaporate. The heat of vaporization is 85.3 calories per gram. How much heat could be removed from the skin if 2.70 grams of ethylene dichloride were sprayed on and allowed to evaporate?
A)31.6 cal
B)230 cal
C)0.00320 cal
D)0.00400 cal

Question

Quizplus · Accepted Answer

The heat removed is calculated by multiplying the mass of ethylene dichloride by its heat of vaporization: 2.70 grams * 85.3 cal/gram = 230.31 cal, which rounds to 230 cal.

Ethylene Dichloride Is an Effective Cooling Agent When Allowed to Evaporate