# extothermic reactions

• May 6th 2008, 04:47 PM
Seza<3
extothermic reactions
I have to find out which is true of exothermic reactions:
- Enthalpy of reactants is greater than enthalpy of products.
- Enthalpy of reactants is equal to the enthalpy of products.
- Enthalpy of reactants is less than enthalpy of products.
- Energy is used in an exothermic reaction.
• May 6th 2008, 05:01 PM
Jhevon
Quote:

Originally Posted by Seza<3
I have to find out which is true of exothermic reactions:
- Enthalpy of reactants is greater than enthalpy of products.
- Enthalpy of reactants is equal to the enthalpy of products.
- Enthalpy of reactants is less than enthalpy of products.
- Energy is used in an exothermic reaction.

See this

Yep. An exothermic reaction is essentially telling you that $\Delta H^{\circ}_{\text{rxn}} < 0$, i.e. the change in enthalpy is negative. So the reactants are at a higher energy state than the products.