Answer:

Explanation:
First, we find in the tables the ΔH of formation of each compound. As you can see in the (image 1)
Then we solve the ecuation for ΔH°reaction
ΔH°reaction=∑ΔH°f(products)−∑ΔH°f(Reactants)
ΔH°reaction= (-2* 393.5 - 2*285.8) - (52.4 + 0) kJ/mol
ΔH°reaction = -1.41 *10^3 kJ/mol
Answer:
The answer to this question has been described in details on the screenshots attached to this question.
Thanks. Hope it helps
Answer:
Joan should measure 0.625 mL of 2,12 M HCl solution to create her desired solution.
Explanation:
Molarity of HCl Joan has access to = 
Volume of 2.12 M of HCl Joan use = 
Molarity of HCl Joan desired = 
Volume of 0.053 M of HCl Joan can prepare = 



Joan should measure 0.625 mL of 2,12 M HCl solution to create her desired solution.