Specific Heat Problems

4 Fe(s) + 3O$_2$(g) $\longrightarrow$ 2 Fe$_2$O$_3$(s) $\triangle$H = -1640 kJ

How many kJ of heat can be produced from 50.0g iron?

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

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)