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examtwopractice

# examtwopractice - 1 A sample of water weighing 50.0 g at...

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1. A sample of water weighing 50.0 g at 60.5°C was poured into a calorimeter containing 50.0 g of water at 18.5°C. If the temperature is 25.0°C, how much heat is gained by the surroundings during the process? The specific heat of water is 4.184 J/g K. A. 1920 J F. 8786 J B. 3540 J G. –1920 J C. 4630 J H. –3540 J D. 5890 J I. –6070 J E. 6070 J J. –8786 J 2. Calculate H in kJ/mol for the reaction ClF + F 2 ClF 3 using the following data: 2 ClF + O 2 Cl 2 O + OF 2 H = 167.4 kJ/mol 2 ClF 3 + 2 O 2 Cl 2 O + 3 OF 2 H = 341.4 kJ/mol 2 F 2 + O 2 2 OF 2 H = –43.4 kJ/mol A. –65.3 F. –276.1 B. –108.7 G. 552.2 C. –130.6 H. 465.4 D. –217.4 I. 217.4 E. –232.7 J. 130.6 3. A wavelength of radiation that falls in the microwave region of the electromagnetic spectrum is 0.122 m. How many photons of this radiation are required to raise the temperature of 100 g of water by 10.0°C? The specific heat of water is 4.184 J/g K. 4. Light of wavelength 221 nm striking a sample of tungsten causes electrons to be ejected with a kinetic energy of 100 kJ/mol. What is the minimum energy required to observe the photoelectric effect for tungsten? A. 1.07 x 10 –18 J F. 1.71 x 10 –19 J B. 1.63 x 10 –18 J G. 3.37 x 10 –19 J C. 1.80 x 10 –18 J H. 5.62 x 10 –19 J D. 1.97 x 10 –18 J I. 7.33 x 10 –19 J E. 1.66 x 10 –19 J J. 8.99 x 10 –19 J

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examtwopractice - 1 A sample of water weighing 50.0 g at...

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