Draw a structural formula for each of the following organic halides; •1,2-dichloroethane (solvent for rubber) • tetrafluoroethene (used in the manufacturing of Teflon) • 1,2-dichloro-1,1,2,2-tetrafluoroethane (refrigerant) ⚫1,4-dichlorobenzene (moth repellent) If needed, attach a copy of your answers to this question.

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8. The diagrams below represent equilibrium mixtures at 298 K and 500 K of the reaction A2(g) + B2(g) = 2AB(g) The A2 molecules are shown in solid blue, B2 molecules in white and the AB molecules in blue and white. 8. 8. 8. 298 K 500 K Which of the following statements is true? i. The reaction is exothermic. ii. A mixture of 1 mol of A2, 1 mol of B2 and 1 mol of AB at 298 K will proceed towards products to reach equilibrium. iii. At equilibrium, the rate constant of the forward reaction is equal to the rate constant of the reverse reaction.

510. In an experiment, liquid heptane, C₂H₁6(1), is completely combusted to produce CO₂(g) and H₂O(1), as represented by the following equation. zemina inst C₂H₁6) + 11 O₂(g) →7 CO₂(g) + 8 H₂O(1) The heat of combustion, AH comb, for one mole of C₂H₁6() is -4.85 x 10³ kJ. Determine the enthalpy of formation, AHºf, for C₂H16(1)

What is the standard heat of formation of C2H4 H2+1/2O2>H2O.   -242kj/mol 2C+3H2+1/2O2>C2H5OH. -273kj/mol C2H4+H20>C2H5OH.    -88kj/mol 2C+2H2>C2H4

A student adds 190.0 g of C7H6O3 to an excess of C4H6O3 producing C9H8O4 and C2H4O2. Write and balance the equation. Then, calculate the percent yield if 241 g of aspirin (C9H8O4) is produced. Show all work.