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15 solutions

First Law of Thermodynamics

Q. Calculate ΔE° for the following reactions at 25 °C. Use standard enthalpies of formation from the table below.

Solved • Dec 4, 2019

First Law of Thermodynamics

Q. Find ΔE° (kJ) for the reaction below if the process is carried out at a constant pressure of 1.00 atm and ΔV (the volume change) = -24.5 L. (1 L•atm = 101 J) 2 CO(g) + O2(g) → 2 CO2(g) ΔH° = -566 kJ Enter your answer as the nearest whole number and no units.

Solved • Nov 20, 2019

First Law of Thermodynamics

Q. The standard molar enthalpy of formation of NH3(g) is -46.11 kJ/mol. What is the standard molar internal energy of formation of NH3(g)? a) 2433 kJ/mol b) -48.59 kJ/mol c) -43.63 kJ/mol d) -2525 kJ/mol

Solved • Nov 19, 2019

First Law of Thermodynamics

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

First Law of Thermodynamics

Q. The definition of internal is ΔU = q + w Which of these three values are state functions? Select all of the correct answers. a) ΔU b) q c) w

Solved • Nov 19, 2019

First Law of Thermodynamics

Q. Which of the following statements concerning the first law of thermodynamics is/are true? Select all of the correct answers.

Solved • Nov 19, 2019

First Law of Thermodynamics

Q. A gas cools, and the heat transferred in the process is 1550 J. At the same time it is compressed, and the work involved in compression is 640.0 J. Calculate the change in internal energy for the gas in joules.

Solved • Oct 19, 2019