you reacted magnesium with a hydrochloric acid aqueous solution and hydrogen gas was produced. Let's say that you collected the gas given off by the reaction and measured it's pressure as 102.1 kPa. If the vapor pressure of water is 16.2 kPa at this temperature, then what is the pressure of the hydrogen gas?
Pressureh2=atm-vaporpressurewater
To calculate the pressure of the hydrogen gas, we need to subtract the vapor pressure of water from the total pressure measured. Here are the steps to get the answer:
Step 1: Determine the pressure of the hydrogen gas by subtracting the vapor pressure of water from the total pressure measured.
Pressure of hydrogen gas = Total pressure measured - Vapor pressure of water
Step 2: Substitute the given values into the equation.
Pressure of hydrogen gas = 102.1 kPa - 16.2 kPa
Step 3: Perform the subtraction.
Pressure of hydrogen gas = 85.9 kPa
Therefore, the pressure of the hydrogen gas is 85.9 kPa.