Q.

The reaction A→B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

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a

0.5 hour

b

0.25 hour

c

2 hour

d

1 hour

answer is D.

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Detailed Solution

A      →                      B t=      0                                            0.8                               0t=      1                                             (0.8−0.6)                0.6t=      0                                             0.9                               0t=      ?                                              (0.9−0.675)              0.6751st order, t=2.303klogaa−x1=2.303klog0.80.2                          k=2.3031log 4k=2.303  ×  0.6020t=2.3032.303×0.6020log0.90.225=2.303×0.60202.303×0.6020=1  hr.
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