The dissociation of ammonium carbamate may be represented by the equation

${\mathrm{NH}}_4{\mathrm{CO}}_2{\mathrm{NH}}_{2\left(\mathrm{s}\right)}\rightleftharpoons 2{\mathrm{NH}}_{3\left(\mathrm{g}\right)}+{\mathrm{CO}}_{2\left(\mathrm{g}\right)}$

${\mathrm{\Delta H}}^{\circ }$ for the forward reaction is negative. The equilibrium will shift from right to left if there is