Question

)A sample of nitrogen gas occupies 0.35 dm3 of volume at STP. Calculate its volume at 650C and 0.75 atm pressure.​

Answer 1

Answer:

T

2

P

1

V

1

=

T

2

P

2

V

2

P

1

=1atm

V

1

=350cm

3

T

1

=273k

P

2

=0.5atm

T

2

=550k

V

2

=?

V

2

=

T

1

P

2

P

1

V

1

T

2

V

2

=1 × 350 ×550 / 273 × 0.5

V

2

= 1409 cm

3

Therefore B is the correct option.

Answer 2

Given - Pressure, Temperature

Find - Volume

Solution - The volume at given conditions is 1.6 dm³

The pressure, volume and temperature are related to each other as follows -

P1V1/T1 = P2V2/T2. In the formula, P1, V1 and T1 are initial pressure, volume and temperature. P2, V2 and T2 are final pressure, volume and temperature.

At STP, P1 is 1 atm and T1 is 273 Kelvin.

T2 = 273 + 650

T2 = 923 Kelvin

Keep the values in the formula to find the value of V2.

1*0.35/273 = 0.75*V2/923

V2 = 1*0.35*923/(273*0.75)

V2 = 1.6 dm³

So, the volume at given conditions is 1.6 dm³.