1 answer

Review Problem 6.084 Calcium hydroxide reacts with hydrochloric acid by the following equation: Ca(OH)2(aq)2HCI(aq)CaCl2(aq) +2H20() Calculate...

Question:

Review Problem 6.084 Calcium hydroxide reacts with hydrochloric acid by the following equation: Ca(OH)2(aq)2HCI(aq)CaCl2(aq)
Review Problem 6.084 Calcium hydroxide reacts with hydrochloric acid by the following equation: Ca(OH)2(aq)2HCI(aq)CaCl2(aq) +2H20() Calculate AHo in kilojoules for this reaction, using the following equations as needed. CaO(s)+2HCI(aq) CaCl2(aq) +H20() AHo=-186 k) CaO(s) +H20()Ca(OH)2(s) AHO Ca(OH)2(s)Ca(OH)2(aq) AHo = -12.6 kJ (dissolving in water) -65.1 kJ AHo kJ The number of significant digits is set to 3; the tolerance is +/-2 % Show Work is REQUIRED for this question: Open Show Work SHOW HINT LINK TO TEXT

Answers

Lets number the reaction as 0, 1, 2, 3 from top to bottom

required reaction should be written in terms of other reaction

This is Hess Law

required reaction can be written as:

reaction 0 = +1 * (reaction 1) -1 * (reaction 2) -1 * (reaction 3)

So, ΔHo rxn for required reaction will be:

ΔHo rxn = +1 * ΔHo rxn(reaction 1) -1 * ΔHo rxn(reaction 2) -1 * ΔHo rxn(reaction 3)

= +1 * (-186.0) -1 * (-65.1) -1 * (-12.6)

= -108.3 KJ

Answer: -108 KJ

.

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