Answer:
The resulting pressure is 4.2 atm. Since it's an ideal gas we use the ideal gas equation to calculate the final pressure.
Explanation:
p.v=n.R.T
This applies to both initial and final conditions of the gas, since the temperature is held constant:
[tex]\frac{P_{1}.V_{1}}{n_{1}.R}=\frac{P_{2}.V_{2}}{n_{2}.R}[/tex]
And using this equation we find the value of pressure:
[tex]\frac{1.4atm.3L}{1L}=p_{2}[/tex]