Answer:
Final pressure of he gas is 0.3 atm.
Step-by-step explanation:
It is given that,
Initial pressure of the gas, P₁ = 1.2 atm
Initial volume of the gas, V₁ = 1 L
Final volume of the gas, V₂ = 4 L
We need to find the final pressure of the gas. It can be calculated using Boyle's law as :




So, the final pressure of the gas at constant temperature is 0.3 atm. Hence, this is the required solution.