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S(s). The reaction is extremely exothermic and can be considered as irreversible. Write the chemical reaction: When mixing 48.6g of Al with 76.8g of S, which reactant is the limiting one? As the unique justification, give xmax : Question 2(0,75) : Balance the following equations using the smallest wholenumber coefficients, then write the expression of the equilibrium constant Kc(Kp when gas are involved) for each reaction: a) Ca(OH)2(s)Ca2(aq)+OH(aq) b) SO2(g)+O2(g)SO3(g) c) CO2(g)+H2(g)H2O(g)+C(s) Question 2 (2.75): A method of industrial preparation of hydrogen involves the gas phase reaction with the following equation: CH4+H2OCO+3H2 The reaction takes place under a constant total pressure Ptot=10 bar. The temperature of the system remains constant. The equilibrium constant Kp is equal to 15. Initially, the system contains 10 moles of CH4,30 moles of H2O,5 moles of CO and 15 moles of H2. 1) Express the equilibrium constant as a function of the partial pressures of the constituents. 2) Express the reaction quotient Q as a function of the number of moles of each constituents (nou., nwio.,n(0,,nM1 ) and of the total pressure Ptot- 4) If the system is not in equilibrium, is there a tendency to form more reactants or more products? Justify briefly. 5) Determine the advancement factor xeq and the composition of the system at equilibrium, starting from this new initial state. The total pressure remains equal to 10 bar