Question

A gas occupies 255ml volume at 3.2 atm at 27C. calculate the
pressure needed to reduce its volume to 160ml at 300K.

Answer 1

Answer:

Given: P

1

=745 mm Hg

V

1

=250 ml

V

2

=200 ml

∴ By Boyle's law as the temperature is constant.

P

2

=

V

2

P

1

V

1

=

200

745×250

=931.25 mm Hg

Additional pressure required =931.25−745=186.25 mm

Answer 2

• Given: P 1

• =745 mm HgV 1

• =250 ml V 2

• =200 ml

• ∴ By Boyle's law as the temperature is constant.

• P 2= V 2 / P 1 V 1 = 200/745×250

=931.25 mm Hg

• Additional pressure required =931.25−745=186.25 mm

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