Take a specific example to show that Delta S(total) is a criterion for spontaneity of a change.

Cite an example to show that enzymes are highly specific.

Most of the naturally occurring processes are spontaneous. a) Give the criteria for spontaneity of a process in terms of free energy change ( DeltaG ) b) Exothermic reactions associated with a decrease in entropy are sponaneous at lower temperatures. Justify on the basis of Gibbs equation. c) Find the temperature above which the reactin MgO_((s))+C_((s))rightarrow Mg_((s))+CO_((g)) becomes spontaneous. (Given ( Delta_rH^theta=490kJmol^-1 & Delta_rS^theta=198JK mol^-1 )

By giving a counter example, show that the following statements are not true p: If all the angles of a triangle are equal, then the triangle is an obtuse angled triangle

By giving a counter example, show that the following statements are not true. i) p: If all the angles of a triangle are equal, then the triangle is an obtuse angled triangle. ii) q: The equation x^(2)-1=0 does not have, a root lying. between 0 and 2 .

a) For the oxidation of iron 4 Fe_((s))+3O_(2(g))rightarrow2Fe_2O_(3(s)) , entropy change is -549.4 JK^-1mol^-1 at 298 K. Inspite of the negative entropy change of this reaction, why is the reaction spontaneous? ( DeltaH_r^0 for the reaction is - 1648xx10^3Jmol^-1 ). b) Write the difference between extensive and intensive properties. Give one example of each.