When a 5.12-g sample of solid sodium nitrate dissolves in 58.0 g of water in a coffee-cup calorimeter (see above figure) the temperature falls from 21.00 oC to 16.05 oC. Calculate H in kJ/mol NaNO3 for the solution process.

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When a 5.12-g sample of solid sodium nitrate dissolves in 58.0 g of water in a coffee-cup calorimeter (see above figure) the temperature falls from 21.00 oC to 16.05 oC. Calculate H in kJ/mol NaNO3 for the solution process.

 

NaNO3(s)  Na+(aq) + NO3-(aq)

 


The specific heat of water is 4.18 J/g-K.



Hsolution =                              kJ/mol NaNO3.

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