Question

1.ethyl chloride is sold as a liquid under pressure for the use as a local skin anesthetic. ethyl cholride boils at 12 degree celsius at atmospheric pressure. When the liquid is sprayed onto skin, it boils off, cooling and numbing the skin as it vaporizes.

a. what charges at state are involved in this use of ethyl chloride

b. what is the boling point of cholride in degrees fahrenheit

c. a bottle contains 103.5 ml ethyl chloride. the denisty of ethyl chloride at 25 degree celsuis is 0.765g/ml . what is the mass of ethyl chloride in the bottle

2. water has a density of 0.997g/ml at 25 degree celsuis ; ice has a density of 0.917 g/ml at -10 degree celsius. if a soft drink bottle whose volume is 1.50L is completely filled with water then frozen to -10 degree celsius. what volume does the ice occupy?

Answer 1

A1:

a) Evaporation of Ethelene Chloride takes place and it is an endotermic reaction. It absobrs heat from a body and evaporated. The heat absorbed by the boiling liquid on tissues produces a deep and rapid chill, but since the boiling point is well above the freezing point of water, it presents no danger of frostbite.

b) °F = (°C * 9/5 + 32)

°F = (12 * 9/5 + 32)

Boiling Point = 53.6 °F literature may says 12.27 °C (54.09 °F; 285.42 K)

c) volume of ethylene chloride = 103.5 ml

density = 0.765 g/ml

mass = density * volume

mass = 0.765 * 103.5

mass = 79.1775 gr

A2:

0.997 gr H2O - 1ml

1.5 L H2O - x

x = 1495.5 gr in 1.5 L H20

0.917 solid H2O - 1ml

1494.5 G solid H20 - x

x = 1.6309 L of Ice