Question

22. What is the volume of a sample of oxygen at a pressure of
3.5 bar is the volume at 1 bar is 3.15 litre at the same
temperature?​

Answer 1

Answer:

The gas should be kept at -248 degrees C.

Explanation:

Use Charles Law. Temperature and Volume are directly related using degrees Kelvin. ( if the pressure and number of molecules are kept constant.

V

1

T

1

=

V

2

T

2

V

1

=

37.5

l

T

1

=

35

+

273

=

308

degrees K

V

2

=

3.0

l

# T_2 = unknown

Substituting these numbers into the equation gives

37.5

308

=

3.0

T

2

multiplying across gives

T

2

=

308

×

3.0

37.5

Which gives

# T_2 = 24.6 degrees K

Subtract 273 to find degrees C.

24.6

−

273

=

−

248

degrees C. ( to three significant digits.)

Answer 2

Answer:

Here, P1=1bar, P2=3.5 bar, V1=3.15L , V2=? From Boyle's law equation P1V1=P2 V2, we get V2=P1 V1 P2=1.00 bar×3.15L /3.5bar=0.90L