5. (5 points) For each of the following Dairs of compounds circle the one that h

Question

5. (5 points) For each of the following Dairs of compounds circle the one that has the largest amount of chemical (potential energy) energy. Explain each choice in one sentence. h consider this in terms of the oxidation numbers of the atoms in each compound. Set A: Set B KNO3 and CH4 KCIO3 and H20 6. (5 points) Which one of the following reactions occurring at 25 °C does the symbol AHfo[CH4@l refer to? (Hint: Apply the definition for the heat of formation 1/) a) CH4(g) Cgraphite(s) + 2 H2(g) b) Cgraphite(s) + 2 H2(g)-> CH4(g) c) Cdiamond(s) + 2 H2(g) CH4(g) d) Cgraphite(s) + 4 H (g) CH4(g) e) 2CH4(g) 2Cgraphite(s) + 4 H2(g)

Explanation / Answer

5.KNO3 has more potential energy than CH4 as it is an ionic compound which has strong electrostatic force of attraction between the constituting ions.

KClO3 has more potential energy.

6. Enthalpy of formation is defined as the amount of heat energy released or absorbed when 1 mole of a substance is formed under standard conditions from its constituent atoms in the elemental state under the same conditions.

In the given options,option b) represents the correct definition for enthalpy of formation of one mole of methane.

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