A certain spring that obeys Hooke's law is stretched by an external agent. The work done in stretching the spring by $10$ cA certain spring that obeys Hooke's law is stretched by an external agent. The work done in stretching them is $4$ J$.$ Howh additional work is required to stretch the spring an additional $10$ cm$?$

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$2$ HI$($g$)$ H$2($g$)+$ I$2($g$)$

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At $800$ K it takes $96\mathrm{.}2$ seconds for the initial concentration of HI to decrease from $7\mathrm{.}7510-2$M to $4\mathrm{.}5010-2$M$.$ What is the rate constant for the reaction at this temperature?