10618 G of an Unknown Salt Is Dissolved in a Coffee

10.618 g of an unknown salt is dissolved in a coffee cup calorimeter that contains 50.0 mL of water.The measured temperature decreased from 23.8 °C to 22.7 °C.Identify the unknown salt.The specific heat of water is 4.184 J g^-1 °C^-1,and assume the density of the solution is 1.00 g mL^-1.

A) NaF, $D _ { \mathrm { r } }$ H = 0.91 kJ mol^-1
B) NaBr, $D _ { \mathrm { r } }$ H = -0.60 kJ mol^-1
C) NaNO₃, $D _ { \mathrm { r } }$ H = 20.50 kJ mol^-1
D) LiNO₃, $D _ { \mathrm { r } }$ H = -2.51 kJ mol^-1
E) LiBr?2H₂O, $D _ { \mathrm { r } }$ H = -23.26 kJ mol^-1

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