Answer to Question #211815 in General Chemistry for Meep

Question

1. A piece of zinc at 20.0∘C that weighs 60.0 g is dropped into 200.0 g of water at 100.0∘C. The specific heat of zinc is 0.389J/g∘C, and that of water near 100.0∘C is 4.22 J/g∘C. Calculate the final temperature reached by the piece of zinc and water.
2. When a 4.25-g sample of solid ammonium nitrate (NH4NO3) dissolves in 60.25 g of water in a coffee-cup calorimeter, the temperature drops from 22.55∘C to 16.0∘C. How much heat was transferred in the process?
3. A 2.200-g sample of quinone (C6H4O2) is burned in a bomb calorimeter whose total heat capacity is 7.857 kJ/∘C. The temperature of the calorimeter increases from 23.44∘C to 30.57∘C. What is the heat of combustion per gram of quinone? 
4. Under constant-volume conditions, the heat of combustion of glucose (C6H6O6) is 15.57 kJ/g. A 3.500-g sample of glucose is burned in a bomb calorimeter. The temperature of the calorimeter increased from 20.94∘C to 24.72∘C. What is the total heat capacity of the calorimeter?

Answer 1

1.Final temperature=97.8°C

2.Heat released;$q = -1280.3 J$

3.Heat of combustion per gram of quinone=$-25.45kJ/mol$

4.Total heat capacity of the calorimeter$=14.42kJ/C$