Part A

Mothballs are composed primarily of the

hydrocarbon naphthalene $(C_{10}{H}_8).$ When $1\mathrm{.}039g$

of naphthalene burns in a bomb calorimeter, the

temperature rises from $26\mathrm{.}420C$ to $30\mathrm{.}460C.$

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.

${}_{r}U=$

$kJmo{l}^{-1}$

Request Answer

Part B

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

Express your answer using four significant figures.

${}_{r}H=$

$kJmo{l}^{-1}$