Calculate the enthalpy change for this reaction:

$2C(s)+H_2(g)C_2{H}_2(g)H=???kJ$

Given the following thermochemical equations:

$C_2{H}_2(g)+\frac{5}{2}{O}_2(g)2C{O}_2(g)+H_{2}O(t),H=-1299\mathrm{.}5kJ$

$C(s)+O_2(g)C{O}_2(g),H=-393\mathrm{.}5kJ$

$H_2(g)+\frac{1}{2}{O}_2(g)H_{2}O(t),H=-285\mathrm{.}8kJ$