A closed system is undergoing an internally irreversible process. Can the entropy of the system decrease?\ Using the entropy balance equation for closed systems, justify your answer.\ (b) In a chemical reaction, which of the following is conserved, and which is not? (i) Mass, (ii) energy, (iii)\ number of moles of various species, (iv) number of atoms of the elements, (v) entropy.\ (c) Why cannot we use a very high compression ratio for gasoline engines to increase thermal efficiency?\ (d) Two intensive properties (temperature and pressure) are given for a closed system that contains a mixture\ of nitrogen and helium. Is it enough to evaluate other intensive properties, e.g., specific enthalpy of the\ system? Use the Gibbs phase rule to justify your answer