Question 1
Calculate the enthalpy of solution for the dissolution of sodium chloride, NaCl, molar mass = 58.443 g mol
-1. When 6.93 g of NaCl is dissolved in a coffee cup calorimeter containing 100.0 mL of water the temperature dropped from 23.5 °C to 22.4 °C. 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.
◦ 4.1 kJ mol
-1◦ 3.9 kJ mol
-1◦ -6.4 kJ mol
-1◦ 6.3 kJ mol
-1◦ -2.8 kJ mol
-1Question 2
Calculate the enthalpy of solution for the dissolution of lithium iodide, LiI, molar mass = 133.85 g mol
-1. When 1.49 g of LiI is dissolved in a coffee cup calorimeter containing 75.0 mL of water the temperature increased from 23.5 °C to 25.7 °C. 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.
◦ -62 kJ mol
-1◦ -76 kJ mol
-1◦ 3
0 kJ mol
-1◦ 18 kJ mol
-1◦ -39 kJ mol
-1
Chemical equilibrium and the law of mass action.
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