Go To Your Study Dashboard

Get Answers to all your Questions

header-bg

An amount of solid $NH_{4}HS$ is placed in a flask already containing ammonia gas at a certain temperature and $0.50\: atm$ pressure. Ammonium hydrogen sulphide decomposes to yield $NH_{3} and H_{2}S$ gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.85 atm. The equilibrium constant for $NH_{4}HS$ decomposition at this temperature is

Option 1)
$0.30$

Option 2)
$0.18$

Option 3)
$0.17$

Option 4)
$0.11$

Answers (1)

As we learnt in

Relation between pressure and concentration -

$PV=nRT$

$or\:P=\frac{n}{V}RT$

$or\:P=CRT$

$R=0.0831\:bar\:inter/mol\:K$

- wherein

P is pressure in Pa. C is concentration in mol / litre. T is temperature in kelvin

and

Law of Chemical equilibrium -

At a given temperature, the product of concentration of the reaction products raised to the respective stoichiometric coefficient in the balanced chemical equation divided by the product of concentration of the reactants raised to their individual stoichiometric coefficients has a constant value.

- wherein

$aA+bB\rightleftharpoons cC+dD$

$K_{c}=\frac{[C]^{c\:[D]^{d}}}{[A]^{a}\:[B]^{b}}$

$[A],\:[B],\:[C]\:[D]$

are equilibrium concentration

$NH_{4}HS(s)\rightleftharpoons NH_{3}(g)+H_{2}S(g)$

Initial pressure 0 0.5 0

At equi. 0 0.5 + x x

Total pressure = 0.5 + 2x = 0.84

$\therefore$ x = 0.17 atm

$K_{p}=p_{H_{3}}s\times p_{H_{2}}s=(0.5+0.17)(0.17)=0.11\ atm^{2}$

Option 1)

$0.30$

This option is incorrect

Option 2)

$0.18$

This option is incorrect

Option 3)

$0.17$

This option is incorrect

Option 4)

$0.11$

This option is correct

Posted by

Vakul

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Advanced 2024: Chemical engineering cut-offs at IITs; know opening, closing ranks

anam-khan

IIT JEE Mains Result 2024 Session 2: How is overall merit list prepared?

anam-khan

JEE Mains Session 2 result 2024 soon; List of top NITs in India

Latest Question