Question

50ml of hydrogen is collected over water at 17C and 750mm of Hg pressure. Calculate the volume of dry gas at STP. The vapour pressure of dry gas at 17C is 14mm of Hg​

Answer 1

P

1

=750mmHg−14mmHg=736mmHg

V

1

=50cm

3

,T

1

=17

0

C=290K

P

2

=760mmHg

V

2

=?cm

3

,T

2

=0

0

C=273K

Hence the Gas equation

T

1

P

1

V

1

=

T

2

P

2

V

2

290

736×50

=

273

760×V

2

∴V

2

=

290×760

736×50×273

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