Task 2. For the chemical reaction indicated in Table 3, calculate the thermal effect (Н0), the change in entropy (S0), the change in Gibbs energy (G0) and the equilibrium constant (K0) at a temperature of T = 398 K. Determine the direction of the chemical a reaction taking place in a gaseous medium of a given composition. The partial pressures of the components of the gas mixture are given in Table 4.
Analyze the results and answer the following questions:
1. What substances - initial or reaction products - will be more in an equilibrium mixture?
2. What do the phrases mean: “the equilibrium is shifted towards the starting substances” and “the equilibrium is shifted towards the reaction products”?
No. of options Reaction equations
3 2S2 + CH4 = 2H2S + CS2
Table 4
Partial pressures of gas mixture components
No. of options Composition of the initial gas mixture Partial pressures
mixture components, atm
A B C D RA RV RS RD
1 2 3 4 5 6 7 8 9
3 2S2 CH4 2H2S CS2 2.1 0.6 1.8 0.9