Hess's Law Worksheet

Need done ASAP

Calculate $H$ for the reaction $4N{H}_{3(g)}+5O_{2(g)}4N{O}_{(g)}+6H_2{O}_{(g)},$ from the following data.

$N_{2(g)}+O_{2(g)}2NO(g),H=-180\mathrm{.}5kJ$

$N_{2(g)}+3H_{2(g)}2N{H}_{3(g)},H=-91\mathrm{.}8kJ$

$2H_{2(g)}+O_{2(g)}2H_2{O}_{(g)},H=-483\mathrm{.}6kJ$