1 answer

Activities and Due Dates ) HW 6 Assignment Score: 1467/2000 Resources [ Give Up? Question 20...

Question:

Activities and Due Dates ) HW 6 Assignment Score: 1467/2000 Resources [ Give Up? Question 20 of 20 Feedb. > Consider these re
Activities and Due Dates ) HW 6 Assignment Score: 1467/2000 Resources [ Give Up? Question 20 of 20 Feedb. > Consider these reactions, where M represents a generic metal. 2 M(s) + 6 HCl(aq) — 2 MCI, (aq) + 3 H, (9) AH = -646,0 kJ HCl(g) — HCl(aq) AH = - 74.8 kJ H2(g) + Cl, (g) — 2 HCl(g) AH; = -1845.0 MCI,(s) — MCI, (aq) AH, = -273.00 Use the given information to determine the enthalpy of the reaction 2 M(s) + 3C1, (g) - 2 MCI,() AH = 5883.8 + delete

Answers

Lets number the reaction as 1, 2, 3, 4, 5 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 5 = +1 * (reaction 1) +6 * (reaction 2) +3 * (reaction 3) -2 * (reaction 4)

So, ΔHo rxn for required reaction will be:

ΔHo rxn = +1 * ΔHo rxn(reaction 1) +6 * ΔHo rxn(reaction 2) +3 * ΔHo rxn(reaction 3) -2 * ΔHo rxn(reaction 4)

= +1 * (-646.0) +6 * (-74.8) +3 * (-1845.0) -2 * (-273.0)

= -6083.8 KJ

Answer: -6083.8 KJ

.

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