The first order reaction law of kinetics is "t=" "2.303 \\over k" "log" "a\\over (a-x)"
Where t= time taken for the reaction "= 1.5" seconds.
k= the rate constant "=0.75s^{-1}"
a is the initial amount of reactant "=0.27 M"
(a-x) is the amount left "= unknown"
"1.5=" "2.303\\over 0.75" "log" "0.75\\over (a-x)"
"1.5=(3.071) log" "2.7\\over (a-x)"
"(a-x)=0.087" mol/L
The amount of concentration left after "1.5" seconds "=" "0.087 mol\/L"
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