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Q.

0.5 moles of N2 gas is mixed with 0. 72 mole of O2 gas in a 2 liter tank at 2000 K The two gases react as:

N2(g)+O2(g)⇌2NO(g);Kp=4.9×10−5 at 2000 K

The equilibrium concentration of NO(g) Will be:

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a

4.2×10−3M

b

6.3×10−3M

c

2.1×10−3M

d

7×10−3M

answer is C.

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Detailed Solution

In the following reaction;

N2+O2⇌2NO

0.5 0.72  0.5-x 0.72-x  ~0.5 ~0.72

4x2(0.5)(0.72)=4.9×10−5⇒x=2.1×10−3

[NO]=2x2=x

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