Chapter 6, Problem 122CWP

Calculate ∆H for the reaction

${\text{N}}_2{\text{H}}_4\left(l\right)+{\text{O}}_2\left(g\right)\to {\text{N}}_2\left(g\right)+2{\text{H}}_{\text{2}}\text{O}\left(l\right)$

given the following data:

Equation	∆H(KJ)
${\text{2NH}}_{\text{3}}\left(g\right)+3{\text{N}}_2\text{O}\left(g\right)\to 4{\text{N}}_2\left(g\right)+3{\text{H}}_2\text{O}\left(l\right)$	−1010
${\text{N}}_{\text{2}}\text{O}\left(g\right)+3{\text{H}}_2\left(g\right)\to {\text{N}}_2{\text{H}}_4\left(l\right)+{\text{H}}_2\text{O}\left(l\right)$	−317
$2{\text{NH}}_3\left(g\right)+\frac{1}{2}{\text{O}}_2\left(g\right)\to {\text{N}}_2{\text{H}}_4\left(l\right)+{\text{H}}_2\text{O}\left(l\right)$	−143
${\text{H}}_2\left(g\right)+\frac{1}{2}{\text{O}}_2\left(g\right)\to {\text{H}}_2\text{O}\left(l\right)$	−286