What energy change is observed?

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1 Answer
Truong-Son N.
Apr 11, 2018

This is just asking you to convert an intensive quantity into an extensive quantity.

You have #"kJ/mol"#, and you want #"kJ"#. We observe extensive quantities in real life, and we want to report them in intensive quantity units for convenience.

#64.0 cancel("g NH"_3) xx ("1 mol NH"_3)/(17.0307 cancel("g NH"_3)) = "3.758 mol NH"_3#

And therefore, the energy change is

#color(blue)(q_(rxn)) = -"23.33 kJ"/cancel("mol NH"_3) xx 3.758 cancel("mols NH"_3) = color(blue)(-"87.7 kJ")#

What is the energy produced?

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