Question

Extra Credit 4. In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a coffee- cup calorimeter (at constant pressure), the temperature rose from 25.0°C to 38.7°C. The dissolution process is: CaCl (s) - Ca2+ (aq) + 2C1- (aq) The heat capacity of the solution and the calorimeter is 12581/°C. The molar mass of Calais 110.98 g/mol 1) Determine the heat that was absorbed by the solution and calorimeter. (1 point) 2) Determine the heat that was released from the dissolution of CaCl, in the experiment. (1 point) 3) Calculate the enthalpy change, AH, of the dissolution written as the given equation.fi.e. Find the heat released for 1 mole of CaCl, dissolving in water therefore AH = moles) (1 point) 4) How much heat would evolve when 1.20 mole of CaCl, dissolves in water? (1 point) 5. The first line of the Lyman series of the hydrogen atom emission results from a transition from the n = 2 level to the n = 1 level. What is the wavelength of the emitted photon? Describe the region of the electromagnetic spectrum in which this emission lies. (2 points)

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Answer 1

1) Heat absonbed by the solution and calorimeter = heat capacity * change in temperature = 1258 Jloc x(38.7 – 25.0) °C - 17234.6 J 2) Heat released from the dissolution of Cally = heat absorbed by the solution am calorimeter = 17234.6 J 23.69 -0.213 mol 3) Moles of Cally taken = 132 mm 110.98 g/mol , 172344.6 J - = 80913.6 J/mol = 80.9 kJ/mol OH = 0.213 mol 4) 1 mol cau, prouces $0.9 kJ heat : 1.2 Cally 1 80.9 x1.2 kJ heat = [97.08 kJ heat page-1

5. Rydbeng Equation 1 = Ro ( 1 ) ) whene, RH = Rydbeng comtent = 109737 emi 1= wavelength of emitted photon (cm) nit ng are principal quantum number of lorder and higher energy levels respectively. : * = 109737 (-) + 1 = 1,215 x105 : The ware is (1.215 x105 cm :: This emission lies in the ultraviolet (UV) regiou the electromaguetic spectrum, page-2 o