What is the written the equation for the reaction between Hydrogen and Oxygen that produces water?

Palmitic acid is one of fatty acids found in butter. It is a saturated fatty acid containing 16 carbon atoms. A student performed the reaction between palmitic acid and methanol in the presence of acid catalyst to give the corresponding ester. 1. Draw the reaction occurred in this experiment! 2. Given that enthalpy of formation palmitic acid, methyl palmitate, methanol and water are -764, -726, -238, -285 KJ/mol, respectively. Determine the enthalpy of the reaction! 3. Methyl palmitate can be utilized as a starting material in the production of soap through saponification reaction. Draw the reaction occurred in this process!

The reaction CO (g) + H2O(g)    CO2(g) 2 + H2(g) has ΔH = -41 kJ/mol. Does the amount of H2 in an equilibrium mixture increase or decrease when the temperature is decreased?

What is the half-reactions and the Ecell to this equation: 2Ag (s)+H2S (g)+ 1⁄2O2 (g) →Ag2S+H2O (l)