Hess's Law Worksheet

Calculate $H$ for the reaction $2A{l}_{(s)}+3C{l}_{2(g)}2AlC{l}_{3(s)},$ given:

$2A{l}_{(s)}+6HC{l}_{(aq)}2AlC{l}_{3(aq)}+3H_{2(g)},H=-1049.kJ$

$HC{l}_{(g)}HC{l}_{(aq)},H=-74\mathrm{.}8kJ$

$H_{2(g)}+C{l}_{2(g)}2HC{l}_{(g)},H=-1845.kJ$

$AlC{l}_{3(s)}AlC{l}_{3(aq)},H=-323.kJ$

Given the following enthalpy changes,

$C_{(s)}+O_{2}C{O}_{2(g)},H=-393\mathrm{.}5kJ$

$C{O}_{(g)}+\frac{1}{2}{O}_{2}C{O}_{2(g)},H=-283\mathrm{.}0kJ$

Calculate the enthalpy of combustion of

$C_{(s)}+\frac{1}{2}{O}_{2}C{O}_{(g)}$

$H=$

Calculate the $H$ for the reaction

$2C(s)+H_2(g)C_2{H}_{2(g)}$

$H=?$

Given the following reactions and their respective enthalpies

$C_2{H}_{2(g)}+2\mathrm{.}5O_{2}2C{O}_{2(g)}+H_2{O}_{(l)},H=-1299\mathrm{.}6kJ$

$C(s)+O_{2(g)}C{O}_{2(g)},H=-393\mathrm{.}5kJ$

$H_{2(g)}+\frac{1}{2}{O}_{2(g)}{H}_2{O}_{(l)},H=-285\mathrm{.}8kJ$