Question

a gas is allowed to expand at constant temperature from its initial volume of 400mL to a final volume of 2000mL. The final pressure is calculated to be 5atm. calculate the initial pressure​

Answer 1

Since the temperature remains constant, Boyle's law is applicable

This means that:

P1V1=P2V2

Here, P1=??

V1=400 mL 

P2=100 mm

V2=1000 mL

Putting all the values, we get 

P1×400=100×1000

P1=250 mm

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Answer 2

Answer:

A gas is allowed to expand at a constant temperature from a volume of 400 mL to a volume of one litre. The final pressure of gas is 100 mm of Hg. The initial pressure of the gas in mm is:

ANSWER

Since the temperature remains constant, Boyle's law is applicable

This means that:

P

1

​

V

1

​

=P

2

​

V

2

​

Here, P

1

​

=??

V

1

​

=400 mL

P

2

​

=100 mm

V

2

​

=1000 mL

Putting all the values, we get

P

1

​

×400=100×1000

P

1

​

=250 mm

Hence, the correct option is C: