The half life time for the decomposition of a substance dissolved in $CC{l}_{4}$ is 2.5 hour at $30°$C. How much of the substance will be left after 10 hours, if the initial weight of the substance is 160 gm ?

(A) 20 gm

(B) 30 gm

(C) 40 gm

(D) 10 gm

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First Order Reaction Kinetics