A gas mixture contains 2 moles of Oxygen and 4 moles of Argon at temperature T. Neglecting all vibrational moles, the total internal energy of the system is:
Correct answer: A. 11RT
- A. 11RT
- B. 4RT
- C. 5RT
- D. 7RT
Explanation
The formula of internal energy is U = (nRTf)/ 2where n = number of moles of the gas, f = number of degree of freedom.Keep in mind that: for monoatomic gas, f = 3 and for diatomic gas, f = 5.The internal energy of 2 moles of oxygen (diatomic gas) = U O2UO2 = (2 x 5 x RT)/ 2UO2 = 5RTThe internal energy of 4 moles of Argon (monoatomic gas) = UArUAr = (4 x 3 x RT)/2UAr = 6RTHence, the total energy is:U = UO2+UArU = 5RT+ 6RT = 11RT.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
Practise Thermochemistry and Energetics of Chemical Reactions
728 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Thermochemistry and Energetics of Chemical Reactions questions
The evaporation of water is an example of?
What is the enthalpy of solution of NH4Cl?
In the enthalpy relation, Δ H = (q)p + Δ (PV), the value Δ (PV) can be neglected for the reactions involving?
The heat capacity ratio of a monoatomic gas is:
The equation that represents standard enthalpy of atomization of hydrogen is:
'∆H' will be given a negative sign in: