Final answer:
The pressure of the HCl gas in the mixture can be calculated using Dalton's law of partial pressure.
Step-by-step explanation:
In this problem, we are given that a mixture of HCl gas and neon gas in a 22 L container has a total pressure of 12.5 atmospheres, and the neon partial pressure is 0.8 atm. To find the pressure of the HCl gas, we can use Dalton's law of partial pressure, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each gas.
So, the pressure of the HCl gas can be calculated by subtracting the neon partial pressure from the total pressure:
Pressure of HCl gas = Total pressure - Neon partial pressure
Pressure of HCl gas = 12.5 atm - 0.8 atm = 11.7 atm