Write the condition of temperature for a process to be spontaneous whose `DeltaH` and `DeltaS` values are positive. [Hint: `DeltaG = DeltaH - TDeltaS]

For the reaction 2A+B rarr C at 298 K, DeltaH=400kJ mol^-1 and DeltaS=0.2 kJk^-1mol^_1 . At what temperature will be reaction become spontaneous considering DeltaH and DeltaS to be constant over the temperature range.

In thermodynamics the symbols like DeltaH , DeltaS and DeltaG are commonly used. What do the symbols DeltaH , DeltaS and DeltaG denote?

a) Name the instrument used for measuring the DeltaU of a process. b) What is the value of DeltaG for a reaction at equilibrium? c) DeltaH and DeltaS of a reaction are 30.56 and 0.666 kJ/mol respectively at 1 atm pressure. Calculate the temperature at which the reaction is in equilibrium.

In thermodynamics the symbols like DeltaH , DeltaS and DeltaG are commonly used. how are they related?

At what temperature does the reduction of lead oxide to lead by carbon becomes spontaneous? PbO + C rarr Pb(s) + CO(g) . For the reaction DeltaH and DeltaS are 108.4 kJ mol^-1 and 190 kJ^-1 mol^-1 respectively/

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 )

Enthalpy and Entropy changes of two reactions are given below: Find out whether they are spontaneous or not at 27^oC . Justify. a) DeltaH = 26 kJ/mole, DeltaS = 8.3 J/K/mole b) DeltaH=-393.4 kJ/mole, DeltaS = 6 J/K/mole