Question $7$: What will be the final temperature of a $634-g$ sample of water, initially at $15\mathrm{.}0C,$ after $80\mathrm{.}5kJ$ have been added to it$?($use equation $5\mathrm{.}13$ ; specific heat of water $=4\mathrm{.}184\frac{J}{G}g($:$*C\}$

Question $8$

Using data from $\frac{?}{{?}_{\frac{?}{?}}}$ Appendix $2,$ calculate $H_{rxn}$ for

$CaC{O}_3(s)$CaO$(s)+C{O}_2(g)$

Standard enthalpy of formation from Appendix $2$

$CaC{O}_3(s)$:$-1206\mathrm{.}9k\frac{J}{m}ol$

CaO$(s)$:$-635\mathrm{.}6k\frac{J}{m}ol$

$C{O}_2(g)$:$-393\mathrm{.}5k\frac{J}{m}ol$

Hint: use Equation $5\mathrm{.}18.$