Question

For which of the following reactions, $\Delta H\ne \Delta U$?

• A. $H_{2\left(g\right)}+I_{2\left(g\right)}\to 2H{I}_{\left(g\right)}$
• B. $C_{\left(s\right)}+O_{\left(g\right)}\to C{O}_{\left(g\right)}$
• C. $N_{2\left(g\right)}+3H_{\left(g\right)}\to 2N{H}_{3\left(g\right)}$
• D. $HC{l}_{\left(aq\right)}+NaO{H}_{\left(aq\right)}\to NaC{l}_{\left(aq\right)}+H_2{O}_{\left(l\right)}$

Answer 1

The correct option is C $N_{2\left(g\right)}+3H_{\left(g\right)}\to 2N{H}_{3\left(g\right)}$

$n\left(reactants\right)\ne n\left(products\right)$