Answers: 2
![K=Aexp[-Ea/RT]](/tpl/images/0106/0519/34370.png)
![K=A{exp[-Ea \div RT]}\\K=8\ \times10^{10} s^{-1}{exp[-42000\div 8.314\times298]}\\K=8\ \times10^{10} s^{-1}{exp[-16.95]}\\K=4.35\times10^{^{-8}}\times8.0\times10^{^{10}}s^{-1}\\K=34.8\times10^{2}s^{-1}\\](/tpl/images/0106/0519/c8d7f.png)
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