Ethyl chloride (C₂H₅Cl) boils at 12 °C. When liquid C₂H₅Cl under pressure is sprayed on a room-temperature (25 °C) surface in air, the surface is cooled considerably. (b) Assume that the heat lost by the surface is gained by ethyl chloride. What enthalpies must you consider if you were to calculate the final temperature of the surface?

Video transcript

Hello everyone. Today we are being given a scenario and asked to determine the piece. So it says spray deodorants contain low boiling point compounds. One compound at its deodorant is butane also known as C four H 10, which boils at negative one degree Celsius. When liquid butane is spread on the skin at room temperature. The skin feels cold. If the heat lost by the skin is gained by butane determine the infill piece. That must be used in order to calculate the final temperature of the skin. So the first thing I want to know is that when you are spraying this beauty in out of the can, you're spraying this Beauty in that is in a liquid form into butane that is in a gas form. So the C four H 10. We're gonna say it's a gas form at the final temperature. And then we also note that the skin is cold to the final temperature. So we'll say the final temp for temperature. Therefore the values that you actually need. So say values need is the heat of vaporization of butane as it goes from liquid to gas. You also need the specific heat. So you need the specific heat of butane for when it turns into the gasses form. And then you also need the specific heat of the human body. And you mainly need this to make a comparison between the values. So you need these three values in order to determine the final temperature of the skin. I hope this helped and until next time