Homework Help: chemistry

Posted by Stephen on Friday, March 4, 2011 at 12:17pm.

When 15.3g of NaNO3 was dissolved in water inside a constant pressure
calorimeter, the temperature fell from 25.00 °C to 21.56 °C. If the heat capacity of
the calorimeter (including the water it contains) is 1071 J/°C, What is the enthalpy
change for dissolving 1 mole of NaNO3? NaNO3 → Na+ + NO3- ∆H = ?

what formula do i use to solve this? i know q=C(change in T) but how does the 15.3g of nano3 affect the problem

chemistry - DrBob222, Friday, March 4, 2011 at 10:19pm
You determine q for the system and that is q for 15.3 g NaNO3.
q/15.3 = J/gram. For 1 mole,
J/gram x (molar mass) = ??

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