1.

The thermal decomposition of a compound is of first order. If 50% of a sample of the compound is decomposed in 120 minutes, how long it take for 90% of the compounds to decompose.

Answer»

About240minutes
About 480minutes
About 45MINUTES
About400minutes

Solution :`100 OVERSET(120) to 50 overset(120) to25 overset(120 ) to12.5 overset(120 ) 6.25`
therefore , 10 %liesbetween12.5and 6.25henceapproximately400mintues .


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