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when 3.890 g of solid sodium nitrade are dissolved in 50.00 g of water in a...

when 3.890 g of solid sodium nitrade are dissolved in 50.00 g of water in a styrofoam calorimter to form 53.89 g of aqueous sodium nitrate, the temperature decreases by 3.5 degress.
a) determine the heat flow for this mass of solid.
b) calculate the enthalpy change in kjoules for dissolving one mole of solid.
c) write the balanced thermochemical equation for this reaction.
d) what is the balanced thermochemical equation for the reverse reaction?
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