A metal tank contains three gases: oxygen, argon, and bromine. If the partial pressures of the three gases in the tank are 3.5 atm of O2, 760.0 mmHg of
Br2,and 105 kPa of Ar, what is the total pressure inside of the tank in atmospheres?

The total pressure of the tank is 5.536 atm

Explanation:

Given:

pO₂ = partial pressure of oxygen = 3.5 atm

pBr₂ = partial pressure of bromine = 760 mmHg = 1 atm

pAr = partial pressure of argon = 105 kPa = 1.036 atm

Question: What is the total pressure inside of the tank in atmospheres, ptotal = ?

First at all, all the pressures must be at the same measure, in this case, atm. The total pressure of the tank is the summation of all partial gas pressures: