Answer:
The pressure will be 4, 5 atm
Step-by-step explanation:
We use Boyle Mariotte's formula: for a given mass of gas at constant temperature, the pressure and volume vary inversely proportionally:
P1xV1=P2xV2
P2= (P1xV1)/V2 = (1,5 atm x 6 L)/2 L=4,5 atm