# How to calculate heat of reaction of a single replacement reaction?

1. May 16, 2014

### Austin

In lab I am doing a series of single replacement reactions and I am curious how to calculate the heat of reaction for single replacement reactions and what measurements to take so I can calculate it?

2. May 16, 2014

### bitbot

Since you're doing a lab I would assume that you were already taught the relevant equations and procedures...

Anyways, I think you should provide more details about the reaction.

What are the reagents? What are the phases of the reactants? Catalysts?

Details like these are important in order to determine the ΔHrxn.

As a refresher, the most common equations used to find the ΔHrxn are
• ΔH°=∑ΔvpΔH°f(products)−∑ΔvrΔH°f(reactants)
• ΔH=q=mcΔT

3. May 16, 2014

### Austin

I plan on mixing CuSO4 and Iron in water and I know that for calorimetry you use deltaE=mCdeltaT but I am unsure of how this would work with a single replacement reaction in water? What would be necessary to be able to obtain the overall heat of the reaction BY LAB not theoretical

4. May 16, 2014

### Austin

To make more clear what I am trying to ask (sorry for not asking clearly) is:
Would it give me the correct heat of reaction if I put Iron and CuSO4 in water...recorded the change in temperature and used DE=mCDT?

But once I find DeltaE don't I have to do something else to find DeltaH like divide by the number of moles of reactant or something like that I forget??? This is where my confusion is greatest..

5. May 17, 2014

### Staff: Mentor

Depends on what you aim at. If at the molar heat of the reaction (which is the most logical thing), then yes.