Ways to Calculate ΔHrxn

Name	Specific Heat	Dimensional Analysis	Hess's Law	ΔH_f	Bond Enthalpy	Enthalpy of Phase Change	ΔG=ΔH-TΔS
When would you use	-solutions being added together in a cup -solid being put into solution	when given balanced equation with enthalpy of reaction and mass or moles	two or more equations are given with known ΔH_rxn and an additional equation is given with an unknown ΔH_rxn	given ΔH_f for products and reactants	given bond enthalpies
How would use	q=mcΔT, solve for q then convert joules to kJ then find moles and divide kJ/mol	set up to cancel units, covert from mass to moles to kJ.	modify known equations so that when they are added together they equal the unknown equation, do what ever you did to the known equations to the ΔH_rxnfor those equations and then add	calculate sum of product-sum of reactants, be sure to included coefficients from balanced equation by multiplying them by the ΔH_f	sum of broken bonds minus som of formed bonds -can either calculate by breaking all bonds and forming all new bonds or looking at reactants and product to figure out just which bonds actually were broken and which were formed.