1
answer
0
watching
558
views
11 Nov 2019
1. A 1.00-L gas sample absorbs 10.0 kJ of heat and simultaneously expands against a constant pressure of 1.00 atm until it reaches a final volume 25.0 L. (a) How much work (in kJ) is done by the gas during its expansion? (b) Calculate ÎE for the gas. (1·atm = 101.3 J) (Answer: (a) w' =-2.43 ki, (b) ÎE = 7.57 k) 2. A 50.0-g sample of copper is heated to 100.0°C and then quickly dropped into 30.0 g of water in a Styrofoam cup calorimeter. The initial temperature of water is 21.0°C and the final temperature of water and copper is 31.5°C. (a) How much heat (in Joules) is gained by water? (b) Calculate the specific heat of copper metal? (Specific heat of water = 4.184 J/g°C; assume heat gained by calorimeter is negligible) (Answer: (a) QH120 = 1 .32 x 103 J; (b) Cc,-0.385 J/g.°C)
1. A 1.00-L gas sample absorbs 10.0 kJ of heat and simultaneously expands against a constant pressure of 1.00 atm until it reaches a final volume 25.0 L. (a) How much work (in kJ) is done by the gas during its expansion? (b) Calculate ÎE for the gas. (1·atm = 101.3 J) (Answer: (a) w' =-2.43 ki, (b) ÎE = 7.57 k) 2. A 50.0-g sample of copper is heated to 100.0°C and then quickly dropped into 30.0 g of water in a Styrofoam cup calorimeter. The initial temperature of water is 21.0°C and the final temperature of water and copper is 31.5°C. (a) How much heat (in Joules) is gained by water? (b) Calculate the specific heat of copper metal? (Specific heat of water = 4.184 J/g°C; assume heat gained by calorimeter is negligible) (Answer: (a) QH120 = 1 .32 x 103 J; (b) Cc,-0.385 J/g.°C)
Trinidad TremblayLv2
9 Mar 2019