(Solved): 11.00g of Compound X wth molocular formula C3H4 are burned in a constant,pressure calorimet ...

$11.00\mathrm{g}$ of Compound $\mathrm{X}$ wth molocular formula ${\mathrm{C}}_3{\mathrm{H}}_4$ are burned in a constant,pressure calorimeter containing $15.00\mathrm{kg}$ of water at $25.9\mathrm{C}$. The temperature of the water is observed to rise by $8.114^{?}\mathrm{C}$. (You may assume as the heat released by the reaction is abserbed by the watec, and none by the calorimeter itself.) Calculate the standard heat of formation of Compound $X$ at $25^{?}\mathrm{C}$. Be sure your answer has a unit symbol, it necessary, and round it to 3 significant dgts.