$2K+2H_{2}O2$KOH$+H_2$

$1\mathrm{.}00g$ of solid $K$ is added to $500.mL$ of water, initially at $21\mathrm{.}3C.$ The temperature at the end of the reaction was $23\mathrm{.}5C.$

$c_{soln}=4\mathrm{.}18\frac{J}{g}C,d_{soln}=1\mathrm{.}00\frac{g}{m}L$

What is the heat of reaction, qrxn$?$

$q_{rn}=,J$

Enter either a $+$ or $-$ sign AND the magnitude. Use significant figures.