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Chemistry Questions ►Part - 3 21. Which of the following is correct about thermodynamic system? A. A closed system allows the transfer of mass , but not energy. B. Open and closed systems are anti analogoue system. C. Open and isolated systems are anti analogoue system. D. Isolated system allow the transfer of energy, but not mass . 22. Which of the following is incorrect about chemical thermodynamics ? A. It deals with energy change B. It applies for chemical change C. It applies for both chemical and physical change D. It gives information about the duration of the time required for the chemical process 23. A gas does 135 j of work while expanding at the same time , it absorbs 156 J of heat .What is the change in internal energy ? A. 21 j B. - 21J C. 47 J D. - 47 J 24. At constant pressure A. ∆H = q B. ∆H = E - p∆v C. ∆H = - p∆V D. ∆H = ∆E 25 .what is the change in enthalpy when 2 mole of CO is converted to 2 mole CO2 at a STP ? 2CO(g)+ O2(g) -------> 2CO2 (g) , ∆E = -563.5 KJ A. -566 KJ B. 283 KJ C. 498.6 KJ D.250 KJ 26. Of of the following is intensive property which one ? A. Entropy B. Enthalpy C. Mass D. Volume 27. Which of the following reaction produce a decrease in entropy of the system A. CO2 (s)--------> CO2(g) B. 2KClO3 (s)--------> 2KCl(g) +3O2(g) C. CaCO(s) + CO2 (g)--------> CaCO3(s) D. C12H22O11 ---------> C12H22O11(aq) 28. From the following enthalpy of a reaction 2SO2 (g) + O2(g) -------> 2SO3 , ∆H= -196 KJ 2S(s) + 3O2(g) -------> 2SO3 , ∆H= 790 KJ What is the enthalpy change for the reaction of S(s) + O2(g)-------> SO2(g) A. 297 KJ B. - 297 KJ C. 891 KJ D. - 891 KJ 29. The standard enthalpy formation of most stable from of any element is zero . what do you say about the this statement ? A. It is true because the change in number of mole of reactant and product is zero. B. It is totally false bacuse of the word any substance in statement for this there is some exceptions. C. It is false to some extant because there are some stable elements which their ∆Hf° is zero D. There is no enough information to determine whether the statement is true or false 30. What is the enthalpy formed by the combustion of propane? ∆H°f H20= -285 KJ ∆H°f CO2 = -393.5 KJ ∆H°f C3H8 = -393.5 KJ A. -2220 B. 2220 KJ C. 1110 KJ D. -1110 KJ ንስር Academy ❗️ 🦅ከፍ እንደ ንስር! 🔗SHARE 🔗SHARE

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