Did I Calculate the Enthalpy of MgO and HCl Correctly?

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The discussion revolves around verifying the calculation of enthalpy for MgO and HCl using Hess's Law. A participant expresses concern about the accuracy of their results, feeling that the answers seem unusual. Another user confirms the calculations are mostly correct but suggests adding an additional significant figure to one of the answers. They recommend consulting a textbook or an online resource for standard enthalpy values. The conversation emphasizes the importance of precision in enthalpy calculations and reliable sources for data.
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Using Hess's Law in 2 Questions

Hi, can someone just check my work and see if I did something wrong?
The answers seems strange.
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And someone tell me where I can get the enthalpy values of molecules?

Thanks. :smile:
 
Last edited:
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Please, can someone answer me?
 
Looks good, but your second answer should have one more significant figure. Try looking for a table or appendix somewhere in your book to find the standard enthalpies of certain substances. Or you could check out this link:

http://www.psigate.ac.uk/newsite/reference/chemdata/3.html
 
Thank you very much, Ksinclair!
 

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