Enthalpy Problems

C$_2$H$_4$ + 6 F$_2$ $\longrightarrow$ 2 CF$_4$ + 4 HF

Find the $\triangle$H of the above reaction given:

H$_2$ + F$_2$ $\longrightarrow$ 2 HF $\triangle$H = -537 kJ

2 C + 2 H$_2$ $\longrightarrow$ C$_2$H$_4$ $\triangle$H = +52 kJ

CF$_4$ $\longrightarrow$ C + 2 F$_2$ $\triangle$H = +680 kJ

A 25.0 g piece of metal is heated to 200.0$^\circ$ C and placed in 30.0 g of 25.0$^\circ$ C water. The temperature of the water rises to 41.0$^\circ$ C. What is the specific heat of the metal?

Find the enthalpy of reaction, $\triangle$H$_{rxn}$ , for the combustion of sugar (there is usually a table of enthalpies of formation in the back of chemistry textbooks)

C$_6$H$_{12}$O$_6$ (s) + 6 O$_2$ (g) $\longrightarrow$ 6 CO$_2$ (g) + 6 H$_2$O (l)