## Chapter 8 #99

Michael Lonsway 3O
Posts: 43
Joined: Wed Sep 21, 2016 2:57 pm

### Chapter 8 #99

Hydrochloric acid oxidizes zinc metal in a reaction that produces hydrogen gas and chloride ions. A piece of zinc metal of mass 8.5g is dropped in an apparatus containing 800.0mL of 0.500M HCL(aq). If the initial temperature of the hydrochloric acid solution is 25°C, what is the final temperature of this solution? Assume that the density and molar heat capacity of the hydrochloric acid solution are the same as those of water and that all the heat is used to raise the temperature of the solution.

How do you find the final temperature?

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### Re: Chapter 8 #99

Hi Michael,

This is a tough question, indeed. Firstly, you need to write out and balance the equation. Then you have to find the limiting reagent and the $\Delta H^o_{rxn}$. You find the total heat from the LR. Then you use $q = mC\Delta T$, considering only the weight of the solution.

Hope this helps!

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