Calculate the enthalpy of solution for the dissolution of lithium ...

[torybrooks]

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-1

Question 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
◦ 30 kJ mol-1
◦ 18 kJ mol-1
◦ -39 kJ mol-1

[raenoj]

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