$2$ C$2$H$2($g$)+5$ O$2($g$)$

$4$ CO$2($g$)+2$ H$2$O $($l$),\backslash$Delta Hrxn $=2600\mathrm{.}4$

Calculate the theoretical maximum heat of the reaction $($in kJ$)$ if $6\mathrm{.}905$ g of ethyne $($C$2$H$2)$ reacts with $22\mathrm{.}30$ g of oxygen $($O$2).$ Molar masses $($MM$)$ are given below.

MM$($C$2$H$2)=26\mathrm{.}0373$

MM$($O$2)=31\mathrm{.}9988$

Report your answer to four significant figures without the unit and with the correct sign $(\backslash$pm $).$ Example: $-100\mathrm{.}0$