Question

The volume of a gas at
21°C temperature and 768 mm pressure
is 1 litre. If the d
ensity of the gas is
1.2 gm/litre at NTP, then its mass will
be​

Answer 1

Answer:

We know that the gas follows Ideal gas law, which states

ρT

P

=constant or

ρ

1

T

1

P

1

=

ρ

2

T

2

P

2

Given that Density at NTP is ρ

2

=1.2g/L

T

2

=20

o

C=293.15K and P

2

=76 cm of Hg

We have T

1

=21

o

C=294.15K and P

1

=71.8 cm of Hg

Thus ρ

1

=ρ

2

×

T

1

T

2

×

P

2

P

1

=1.2×

294.15

293.15

×

76

71.8

=1.13g/L

Thus mass of the gas = ρ

2

×V

2

=1.13g/L×1L=1.13g