The formula will be AI2O3
1)Delta H=(Delta H of reactants)-(Delta H of products)
2)And we know CO have 3 bond CO and CO2 have 2 bond that each of them are 2 bond, please see the picture!
so lets answer it:

Steps/Answers:
Jot down the metal name.
Write the metal name ending in -idle.
Combine cation, annion names,
Hope This Helps! Have A Nice Day!!
Molar mass of water 18g/mol
Number of mols = 50.0g/18g/mol =2.78 mol
Heat absorbed = 40.7 kj/mol * 2.78 mol = 113.1 kj.
Answer:
The answer is = LiCl ..............