Question

a gas is allowed to expand at a constant temperature from initial volume of 300 ml to A final volume of 1800 ml at the end of the expansion the pressure of the gas was found to be 1 atmosphere what was the initial pressure of the gas

Answer 1

Use Boyles law which is
P1v1 = p2v2

Here we have to calculate p1
Substitute values of V1, V2 and P2 to calculate P1.

Hope you get your answer.

Answer 2

P1=?

V1=300ml

P2=1atm

V2=1800ml

Using Boyle's law,

P1 V1=P2 V2

Therefore, P1= (P2×V2)/V1

P1= (1×1800)/300

P1= 6atm.