How do you solve #16? NAME points, show all work, detailed partial credit will b

Question

How do you solve #16? NAME points, show all work, detailed partial credit will be applied) Consider the following reaction: 16. (6 N2H4(I) + 2 H2O2(l) N2(g) + 4 H2O(l) Use the information below to find the heat of reaction. AH (kJ/mol) -622.2 -285.8 -187.8 -572 Reaction H2(g) + O2(g) H:02(1) 2112(g) + O2(g) 2 H2O(g) 17. (6 points) A 50.0 mL sample of HCl with an unknown concentration is titrated.It is observed that it takes 33.70 mL of 0.500M potassium hydroxide to neutralize the acid. What is the concentration of acid in the original sample?

Explanation / Answer

16)

Lets number the reaction as 0, 1, 2, 3, 4 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) +2 * (reaction 2) -2 * (reaction 3)

So, deltaHo rxn for required reaction will be:

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

= +1 * (-622.2) +2 * (-285.8) -2 * (-187.8)

= -818.2 KJ

Answer: -818.2 KJ

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