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62 solutions

Internal Energy

Q. Which of the following represent processes with negative values for ΔE for the process described? (i) burning a piece of coal (ii) compressing a balloon to a smaller volume (iii) freezing water

Solved • Dec 31, 2019

Internal Energy

Q. Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 40. cm^3. If the combustion of this mixture releases 950. J of energy, to what volume will the gases expand against a constant pressure of 650. torr if all the energy of combustion is converted into work to push back the piston?

Solved • Dec 27, 2019

Internal Energy

Q. Which of the following will best help determine the direction of heat flow in a system? a) work b) pressure c) temperature d) enthalpy e) internal energy

Solved • Nov 19, 2019

Internal Energy

Q. For a certain reaction a constant pressure, the change in internal energy is -52 kJ. In addition, the system does 46 kJ expansion work. What is ΔH for this process? a) 6 kJ b) 98 kJ c) -6 kJ d) -98 kJ

Solved • Nov 19, 2019

Internal Energy

Q. A 100W electric heater (1W = 1J/s) operates for 11 min to heat the gas in a cylinder. At the same time, the gas expands from 1L to 6L against a constant external pressure of 3.527 atm. What is the change in internal energy of the gas? (1 L.atm = 0.1013 kJ) a) 48.37 kJ b) 62.47 kJ c) 64.21 kJ d) 67.79 kJ

Solved • Nov 19, 2019

Internal Energy

Q. When 4.00 kJ energy is transferred as heat to nitrogen in a cylinder fitted with a piston at an external pressure of 3.00 atm, the nitrogen gas expands from 1.00 to 4.00 L against this constant pressure. What is ΔU for the process? (1 L.atm = 0.1013 kJ) a) -0.912 kJ b) +4.91 kJ c) +3.09 kJ d) 4.91 kJ

Solved • Nov 19, 2019

Internal Energy

Q. When 2.00 kJ of energy is transferred as heat to nitrogen in a cylinder fitted with a piston with an external pressure of 2.00 atm, the nitrogen gas expands from 2.00 to 5.00 L. What is the change in internal energy of this system? (1 L.atm = 0.1013 kJ) a) +1.39 kJ b) -0.608 kJ c) 0 d) +2.61 kJ e) -2.61 kJ

Solved • Nov 19, 2019