(Solved): 7. In the equation for the combustion of pentane, the coefficient of carbon dioxide is A) one B) two ...

7. In the equation for the combustion of pentane, the coefficient of carbon dioxide is A) one B) two. C) three. D) four. E) five. 8. Which of the following is true of nonane, \( \mathrm{C} 9 \mathrm{H}_{2} \mathrm{O} \), which has a density of \( 0.79 \mathrm{~g} / \mathrm{mL} \), melts at \( -51^{\circ} \mathrm{C} \), and boils at \( 157^{\circ} \mathrm{C} \) ? A) Nonane is soluble in water. B) Nonane is a gas at room temperature. C) Nonane is a solid at room temperature. D) Nonane does not undergo combustion. E) Nonane floats on the surface of water. 9. Hydrocarbons are the primary constituents of A) drugs. B) food flavors. C) fossil fuels. D) fruit juices. E) disinfectants. 10. Draw the most stable Newman projection of 2,3-dimethylbutane. Look down the \( \mathrm{C} 2-\mathrm{C} 3 \) bond.