Question 3 Ethyl chloride (C_H_Cl) can be used as a topical anesthetic, for example prior to giving a painful Type numbers in the boxes. injection. When liquid ethyl chloride is sprayed on the skin, energy absorbed from the skin 10 points causes the liquid to evaporate. This numbs the injection site by quickly decreasing the skin temperature to near oC. How much heat (in kJ) is required to evaporate 7.42 mL of ethyl chloride at 25C? kJ For C H Cl: d = 0.924 g/mL and AH, = 24.6 kJ/mol at 25C. vap