11. A gas is allowed to expand, at constant temperature, from a volume of 2.08 L

Question

11. A gas is allowed to expand, at constant temperature, from a volume of 2.08 L to 9.06 L against an external pressure of0.643 atm. Ifthe gas absorbs 332 J of heat from the surroundings, what is AE for this process? A) -258 J B) 787 J C) 328 J D) -123 J E) -787 J 12. Indicate the type of hybrid orbitals used by the central atom in TeF4. A) sp B) sp3 C) sp (D) sp d E) sp 13. Which one of the following molecules has tetrahedral geometry? A) CF4 B) NH3 C) XeF4. 4. Using the table of average bond energies below, the AH for the reaction is H H 831 CEC-H(g) 2HI (g) I C C I (g) Bond: CEC C-C H-1 C-1 C-H Bond Energy 839 348 299 240 413 (kJ/mol): A) -160 B) -63 C) 160 D) +63 E) 217

Explanation / Answer

Q11

V1 = 2.08 L V2 = 9.06 L

P = 0.643 atm constant

Q = 332 J, then find dE

Apply 1st law of thermodynamics

so

Q-W = dE

332 - W = dE

W = -P*(Vf-Vi) = -0.643 * (9.06-2.08) = -4.48814 atmL * 101325/1 * 1 / 1000 = -454.760

dE = 332 - -454.760 = 786.76 J

choose B

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