3. Calculate .\" for the reaction: Use the following reactions and given Cls) +

Question

3. Calculate ." for the reaction: Use the following reactions and given Cls) + 2H2 (g) C(s) + 2 Cl2(g) rs: -- CH. (g) -- CCla(g) 4. Zinc metal reacts with hydrochloric acid according to the balanced equation: Zn(s) 2 HCI (aq)ZnCl2 (aq)+ H2(8) When 0.103 g of Zn(s) is combined with enough HCl to make 50.0 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.5°C to 23.7°C. Find tan for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18J/e'C as the specific heat capacity.)

Explanation / Answer

3)

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) +2 * (reaction 3)

So, deltaGo rxn for required reaction will be:

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

= -1 * (-74.6) +1 * (-95.7) +2 * (-92.3)

= -205.7 KJ

Answer: -205.7 KJ

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