Homework Help: CHEMISTRY

Posted by Cha-Ching on Friday, December 16, 2011 at 9:05am.

1.Calculate the enthalpy change (ΔHērxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. The enthalpy of formation of liquid water is -285.8 kJ/mol.)

2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)

2.Do you know if the reaction is endothermic, thermodynamic, exothermic, or in its standard state?

3. The surroundings of the reaction will either
-get hotter,
-get cooler,
-neither get hotter nor get cooler due to the 2nd Law of Thermodynamics,
-get cooler if ΔG is negative; get hotter if ΔG is positive

CHEMISTRY - DrBob222, Friday, December 16, 2011 at 9:28pm
1. DHr = delta Hf
DHfrxn = (n*DHfproducts) - (n*DHfreactants)

From the number you obtain in the above you will have the information to answer 2 and 3.

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