Question

13. What weight of N, is present in a
22.4 lit flask at 273°C and
380mm?
1) 8g
2) 11g 3) 7g 4) 14g​

Answer 1

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11th

Physics

Kinetic Theory

Molecular Nature of Matter

At. N.T.P. 28 g of Nitrogen...

PHYSICS

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Asked on December 20, 2019 by

Avdinesh Deogan

At. N.T.P. 28 g of Nitrogen occupies 22.4 litres. What is the mass of 5.6 liters of Nitrogen at 38 cm of Hg pressure and 273

0

C temperature

EASY

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ANSWER

Given,

At, NTP (293 K, 76 cm Hg): Volume,V=22.4L ,Number of mole, n

1

=1mole

273

o

C=546K

At (38 cm, 546 K): Volume V=5.6L

From ideal gas equation.

PV=nRT

P

1

V

2

P

1

V

1

=

n

2

RT

2

n

1

RT

1

⇒

38×5.6

76×22.4

=

n

2

R×546

1×R×293

⇒n

2

=0.67mole

1moleN

2

=28g

0.067moleN

2

=28×0.067=1.87g

Hence, mass of nitrogen is 1.87g

hope it helps very much