You will be collecting a gas over water in this experiment. If the class baromet

Question

You will be collecting a gas over water in this experiment. If the class barometer reports an atmospheric pressure of 29.86 inHg at 25 °C, what is the pressure of the gas mixture collected above the water in units of mmHg? Remembering that the pressure of the gas in the head space includes the vapor pressure of water, determine the pressure of the collected dioxygen gas alone. 1. Please describe function of a catalyst in a chemical reaction. What is the catalyst in this experiment? 2. In this lab, only the solutions that contain lead are collected as hazardous waste. Please list at least two reasons lead nitrate is treated with caution in the lab. You might be interested in the safety data sheet (SDS) for lead nitrate. 3.

Explanation / Answer

Ans 1

Atmospheric pressure = 29.86 in Hg x 25.4mm/in

= 758.444 mmHg

Temperature = 25 °C

Vapor pressure of water at 25 C = 23.8 mmHg

From the Dalton's law

Atmospheric pressure = pressure of gas + vapor pressure

Pressure of O2 gas = Atmospheric pressure - Vapor pressure of water

= 758.444 - 23.8

= 734.644 mmHg

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