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Internal Energy

Q. An ideal gas is allowed to expand isothermally from 2.00 liters at 5.00 atm to 5.00 liters at 2.00 atm against a vacuum (i.e., no outside pressure). Which of the quantities q, w, ΔE, and ΔH are zero for this process? 1. w, q, and ΔE 2. Some other combination 3. w and ΔE, 4. w 5. w, q, ΔE, and ΔH

Solved • Apr 22, 2020

Internal Energy

Q. If a system absorbs heat and also does work on its surrounding, its energy 1. must decrease. 2. must not change 3. may either increase or decrease, depending on the relative amounts of heat absorbed ad work done. 4. must increase.

Solved • Apr 22, 2020

Internal Energy

Q. A 10 W electric heater (1 W = 1 J/s) operates for 9.5 min to heat the gas in a cylinder. At the same time, the gas expands from 4 L to 15 L against a constant external pressure of 3.889 atm. What is the change in internal energy of the gas? Answer in units of kJ.

Solved • Apr 22, 2020

Internal Energy

Q. A system performs 3.63 kJ of work and gives off 8.98 kJ of heat what is the change in energy of the system

Solved • Apr 15, 2020

Internal Energy

Q. Calculate the work in kilojoules done during a synthesis of ammonia in which the volume contracts from 9.0 L to 4.2 L at a constant external pressure of 43 atm. Express your answer using two significant figures. In which direction does the work energy flow? a) Energy flows into the system b) Energy flows out of the system What is the sign of the energy change? a) ΔE > 0 b) ΔE < 0

Solved • Apr 9, 2020

Internal Energy

Q. Choose the incorrect statement from the following when ΔE = ΔH A) Process takes place at constant volume B) Process takes place at constant pressure C) Process involves only solids or liquids D) There is no change in number of moles of gaseous reactants and products

Solved • Apr 12, 2020

Internal Energy

Q. A chemical reaction is carried out in a sealed container at constant pressure of 3.25 atm. The initial volume of the container is 1.78 L and the final volume is 3.19 L. Determine the value of w.

Solved • Apr 5, 2020