To find the enthalpy of a reaction using heats of formation, you subtract the reactant heats of formation from the product heats of formation. This is based on Hess's Law which states that the total enthalpy change of a reaction is the sum of the enthalpy changes of the individual steps, regardless of the path taken.

Here are the steps:

1. Write down the balanced chemical equation for the reaction.

2. Look up the standard heats of formation for each reactant and product in the reaction. These values are usually given in tables in chemistry textbooks or online.

3. Multiply the heat of formation of each reactant and product by its stoichiometric coefficient (the number in front of it in the balanced equation).

4. Add up the total heat of formation for the reactants and do the same for the products.

5. Subtract the total heat of formation of the reactants from that of the products. The result is the enthalpy change for the reaction.

Remember, a negative enthalpy change indicates an exothermic reaction (gives off heat), while a positive value indicates an endothermic reaction (absorbs heat).

Question

To find the enthalpy of a reaction using heats of formation, you subtract the reactant heats of formation from the product heats of formation. This is based on Hess's Law which states that the total enthalpy change of a reaction is the sum of the enthalpy changes of the individual steps, regardless of the path taken.

Here are the steps:

1. Write down the balanced chemical equation for the reaction.

2. Look up the standard heats of formation for each reactant and product in the reaction. These values are usually given in tables in chemistry textbooks or online.

3. Multiply the heat of formation of each reactant and product by its stoichiometric coefficient (the number in front of it in the balanced equation).

4. Add up the total heat of formation for the reactants and do the same for the products.

5. Subtract the total heat of formation of the reactants from that of the products. The result is the enthalpy change for the reaction.

Remember, a negative enthalpy change indicates an exothermic reaction (gives off heat), while a positive value indicates an endothermic reaction (absorbs heat).

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To find the enthalpy of a reaction using heats of formation, you subtract the reactant heats of formation from the product heats of formation. This is based on Hess's Law which states that the total enthalpy change of a reaction is the sum of the enthalpy changes of the individual steps, regardless of the path taken.

Here are the steps:

1. Write down the balanced chemical equation for the reaction.

2. Look up the standard heats of formation for each reactant and product in the reaction. These values are usually given in tables in chemistry textbooks or online.

3. Multiply the heat of formation of each reactant and product by its stoichiometric coefficient (the number in front of it in the balanced equation).

4. Add up the total heat of formation for the reactants and do the same for the products.

5. Subtract the total heat of formation of the reactants from that of the products. The result is the enthalpy change for the reaction.

Remember, a negative enthalpy change indicates an exothermic reaction (gives off heat), while a positive value indicates an endothermic reaction (absorbs heat).

To find the enthalpy of a reaction using heats of formation…Group of answer choicessubtract the product heats of formation from reactant heats of formationsubtract the reactant heats of formation from product heats of formation

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