Homework Help: chemistry

Posted by Karn on Saturday, October 28, 2006 at 4:25pm.

if my reaction is 2Na + 2H2O -> 2NaOH +H2, and i have been given 1 gram of sodium, how would i measure teh theoretical change in heat of the reaction, assuming the reactants are at room temperature?

Look in your text, probably in the appendix, for delta H⁰ tables. Those usually are given at 25 degrees C and that is about room temperature.
Heat of rxn = deltaH products - deltaH reactants. The numbers in the appendix are per mol (or kJ/mol), usually; therefore, multipy what you find for NaOH by 2 and what you find for water by 2, etc. Na and H2 will be zero.

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