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ololo11 [35]
3 years ago
9

4. Calculate AH for the reaction

Chemistry
1 answer:
Naddik [55]3 years ago
7 0

Answer:

ΔH = -111.1kJ

Explanation:

ΔH of any reaction could be obtained from similar reaction doing algebraic operations. Using the reactions:

<em>(1) </em>CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) ΔH = -186 kJ

<em>(2) </em>CaO(s) + H₂O(l) → Ca(OH)₂(s) ΔH = -62.3 kJ

<em>(3) </em>Ca(OH)₂(s) → Ca(OH)₂(aq)  ΔH = - 12.6 kJ

(1) - (2):

Ca(OH)₂(s) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l)

ΔH = -186kJ - (-62.3kJ) = -123.7kJ

This reaction -(3):

Ca(OH)₂(aq) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l)  

ΔH = -123.7kJ - (-12.6kJ) = -111.1kJ

<h3>ΔH = -111.1kJ</h3>
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