You have the following equations: 2S (s) + 30 2 (g) – 250 3 (g), A H = -792 kJ 25 (s) + 20 2 (g) – 280 2 (g), A H= -594 kJ 250 2 (g) + O 2 (g) – 250 3 (g), A H = ? What is the missing AH? -198 kJ G G +198 kJ +792 kJ O -594 k)​

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.