what does ΛH means?

Question

I"m working on a chemist assignment

Answer 1

Delta represents change, so this is the change in H

Answer 2

Delta H is basically the amount of energy or heat that either was gained or lost during the reaction. What delta H is greater than 0 this means the reaction is endothermic (heat was gained) and when delta H is less than ) this means it is exothermic (heat was lost).

This is a good image for reference (you may have to copy and paste link into new tab):

https://files.mtstatic.com/site_4334/78935/0?Expires=1620925970&Signature=JPaVe9iFm9rMR8Co0U7G8wWpcqW9CjWmhlBWZdjZ9a5t-bflNlQBBoD4rkOt-x5wy9aWH96jYfm4gW8hVrP~8~cZiuqDUOSzA8wO4Hbk0VjReT-876jDoWZLEHME-JDlsWEkQ7~LOjU~xWEFpZBcHAmpqCSSGSihF6YpY6MLm4Q_&Key-Pair-Id=APKAJ5Y6AV4GI7A555NA