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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