JEE Mains Model Paper 20

Let w g of each be taken, then initial mole of P =

w

10

; mole os Q =

w

20

Final mole of p =

w1

5×10

Final mole of Q =

4w1

20×5

For P

PN0

PN

= eλ2t
For Q =

QN0

QN

= eλ2t
∴ For P

w×5×10

10×w2

= eλ1×20
For Q

w×20×5

20×w1×4

= eλ2×20
By Eqs. (i) and (ii) 4 = e(λ1−λ2)×20
∴ 20 (λ1−λ2) = loge 4
or 20(

0.693

10

−

0.693

t1∕2

) = loge 4