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The equilibrium constant for the reactio...

The equilibrium constant for the reaction `CO_((g)) + H_(2) O_((g)) hArr CO_(2(g)) + H_(2(g)) ` is 5. How many moles of `CO_(2)` must be added to I lit container already containing 3 moles of each of CO and `H_(2)`O to make 2M equilibrium concentration of CO ?

A

15

B

19

C

5

D

20

Text Solution

Verified by Experts

The correct Answer is:
B
`underset(2)underset(3)(CO_((g)))+underset(2)underset(3)(H_(2)O_((g))) harr underset(x+1)underset(x)(CO_(2(g)))+underset(1)underset(0)(H_(2))`
`K_(c)=((x+1)1)/(2 xx 2)=(x+1)/(4) implies 5=(x+1)/(4) implies 20=x+1 implies x=19`
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