If i could get some help understanding these, it would be much appreciated. 16.

Question

If i could get some help understanding these, it would be much appreciated.

16. When ammonia is oxidized in the presence of a platinum catalyst, the reaction represented by the following equation occurs: 4NH3 (g) +502 (g) ? 4NO (g) + 6H20 (1) Find the value of AH, for this reaction using the following standard heats of formation data. Substance NH3 (g) NO (8) H2O (1) AH° (kJ/mol -46.11 90.25 -285.83 17. Which property(ies) of a liquid increases when the temperature is raised? 1. vapor pressure Il. surface tension a) Tonly b) Il only c) Both I and II d) Neither I nor II 18. A 50.0 g ice cube is taken from the freezer at-18.0 °C. When you add 20.0 kJ of heat to this ice cube what is the temperature of the resulting water?

Explanation / Answer

16)

?Hr = ?Hf (products) - ?Hf (reactants)

= ?Hf (4 NO + 6H2O) - ?Hf (4 NH3)

=( 4 * 90.25 + 6 * (- 285.3) - 4 * (-46.11)) kjmol-1

= - 1166.36 kJmol-1

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