Thermochemistry quiz #1
Chapter 6
West Virginia University
Dr. Robert Belford




Question 1
Assuming no heat loss to the environment, calculate the Energy in calories done on a ballon as it expands from 1.0 L to 10.0 L at a constant external pressure of 720 torr. Note; 1 atm-L = 101.3 Joule.
(A)  206cal
(B)  -206cal
(C)  3.58kca
(D)  -3.58kcal
 
Hint

Your response
Not answered yet

Question 2
Calculate the energy change of a ballon if it is compressed from 2.00L to 0.0200L at a constant external pressure of 1.00 atm and releases 08.5J of heat to the environment.
(A)  2.65J
(B)  -2.65
(C)  -19.1J
(D)  192J
 
Hint

Your response
Not answered yet

Question 3
Calculate the energy change of a 30.1 g piece of iron if it is cooled from 400. oC to 25 oC? The specific heat capacity of iron is 0.4513 J/goC.
(A)  5.09kJ
(B)  -5.09kJ
(C)  25.0kJ
(D)  -25.0kJ
 
Hint

Your response
Not answered yet

Question 4
What would be the final temperature of 100. ml of water at 25 deg C if it absorbed 5.09 kJ of heat. Assume the density of water is constant at 1g/mL.
(A)  12 oC
(B)  37 oC
(C)  13oC
(D)  100 oC
 
Hint

Your response
Not answered yet

Question 5
What is the specific heat capacity of a material if it takes 1.508 Kcal to raise 25.0 g of the material from 20.0 to 300.0oC?
(A)  0.9017 j/g.oC
(B)  .1078 .oC
(C)  .2154.oC
(D)  0.0564.oC
 
Hint

Your response
Not answered yet

Question 6
What is the specific heat capacity of an unknown metal object if a 69.07 g piece at 100. .oC is cooled to an equilibrium temperature of 23.0 oC after it is dropped into 100 ml of water at 20.0 oC.
(A)  0.4513 J/g.oC
(B)  0.385 J/g.oC
(C)  0.236 J/g.oC
(D)  0.9017 J/g.oC
 
Hint

Your response
Not answered yet