A student is separating CHC, (bp-61 CHC CHCI (bp 146 °C) by distillation. She ha
ID: 698422 • Letter: A
Question
A student is separating CHC, (bp-61 CHC CHCI (bp 146 °C) by distillation. She has just begun to collect Ar what position in the apparatus will the temperature be 61 ? from 19. The cubie unit cell of a perovskite structure containing 4 atoms of types A, B, and C is illustrated below. What is the empirical formula of this substance the first distillate in the receiving flask (A) ABC (B)ABC (C) AB,C, (D) ABCu 20. The enthalpy change under standard conditions for waich of the reactions below would be equal to the Frof NaOH(s)? (B) B (C) C (D) D (A) A How is the enthalpy of vaporization of a substance related to its enthalpy of fasion? (A) The enthalpy of vaporization is greater than the 15. (A) Na(s) + H,0() NaOH(s) + H,e) enthalpy of fusion. (B) Na(s) + '/2 HAM) NaOH(s) (D) (C) The enthalpy of vaporization is equal to the enthalpy Na.(aq) + OH(ag) NaOH(s) of fusion. 21. A37.5 g piece of gold at 83.0is added to 100. g H2O at 22.0 °C in a well-insulated cup. What is the temperature after the system comes to equilibrium? (The specific heat capacity of Au is 0.129J.g.K (C) The enthalpy of vaporization is less than the enthalpy of fusion (D) There is no general relationship between a substance's enthalpy of vaporization and enthalpy of (A) 22.7°C (C) 25.0°C (B) 23.0 °C (D) 52.5 °C fusion. A 3.0L sample of helium gas is stored in a rigid, sealed container at 25 C and 1.0 atm pressure. The temperature 22. Which of these reactions has AS>0 is increased to 125 *C. What is the new pressure of the gas? 16. (A) SAD sns, monoclinic) (A) 0.20 atm (C) 1.3 atm Diamond is an example of what kind of solid? (A) Ionic (C) Molecular (B) 0.75 atm (D) 5.0 atm (C) Hz(g) + 2 Ag+(aq) 2 HOaq) + 2 Ag(s) 17. (B) Metallic (D) Network covalent 23. Given the enthalpy changes: 18. Which of the following is a mathematical staterment of the A+D-, E + F F- C + E What is AH for the reaction 2A +B+D-2E? (A) 0 kJmol (C) -40 kJ-mol first law of thermodynamics? (B) -30 kJmol (D) -70 kJ molExplanation / Answer
14. The answer is B
The area B represents the distilling head which contains pure vapour which are being distilled and condensed finally collected. Hence, it attains the boiling point temperature of the liquid.
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