Mothballs are composed primarily of the hydrocarbon naphthalene $(C_{10}{H}_8).$ When $1\mathrm{.}383g$ of naphthalene burns in a bomb calorimeter, the temperature rises from $25\mathrm{.}891C$ to $31\mathrm{.}721C.$

Part A

Find ${}_{r}U$ for the combustion of naphthalene. The heat capacity of the calorimeter, determined in separate experiment, is $5\mathrm{.}112kJ{C}^{-1}.$

Express your answer using four significant figures.

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Part B

Find ${}_{r}H$ for the combustion of naphthalene at $298K.$

Express your answer using four significant figures.

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