Final answer:
According to Dalton's law of partial pressures, the total pressure is the sum of the partial pressures of the gases involved in the reaction.
Step-by-step explanation:
Dalton's law of partial pressures states that the total pressure is equal to the sum of the partial pressures.
We simply add the two pressures together:
Ptot = 2.33 atm + 0.77 atm = 3.10 atm