1. The bodies of adult humans are composed of 55-60% water. on specific heat and heat transfer, how does the water help us to disperse heat and regulate our body temperatures?

2. Hydrocarbons and their derivatives are organic compounds that contain carbon and hydrogen, and they easily undergo combustion in air to produce carbon dioxide and water. Octanol (C₈H₁₇OH) is an organic alcohol, which is a derivative of the eight carbon hydrocarbon octane. When burned in air, octanol has an enthalpy of combustion of - 5294 kJ. Based on the information provided, write the balanced thermochemical equation for the combustion of octanol. 

Explain how you developed the equation, and specify what the equation tells us about the reaction?

3. Nitrogen gas can be combined with oxygen gas to form nitrogen dioxide gas (NO₂). Using this information and the reactions below, determine the overall enthalpy for this reaction using Hess's Law. Work must be shown in order to earn credit.

N_{2 (g)} + 3H_{2 (g)} → 2NH_{3 (g)}                                           ΔH = -112.3 kJ

2 NH_{3 (g)} + 4 H₂O _(l) → 2 NO_{2 (g)} + 7 H_{2 (g)}                    ΔH = -144.9 kJ

H₂O _(l) → H_{2 (g)} + ½ O_{2 (g)}                                           ΔH = -48.0 kJ