Question

26. Calculate the volume of dry air at S.T.P. that occupies
28 cm at 14°C and 750 mm Hg pressure when saturated
with water vapour. The vapour pressure of water at 14°C
is 12 mm Hg.
​

Answer 1

Explanation:

P

1

V

1

=

T

2

P

2

V

2

Here, P

1

=750−12=738mm,

V

1

=28cm

3

,

T

1

=14+273=287K,

P

2

=760mm,

T

2

=273K

Then, V

2

=

287×760

738×28×273

=25.9cm

3

Hope it helps

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