How can you predict the spontaneity of a chemical reaction using the following expression:?

Question

∆G = ∆H - T∆S

Explain the effects of ∆H and ∆S

Answer 1

A spontaneous process is one for which DeltaG is less than (or, some might say, equal to) zero. This is because equilibrium is achieved when G is at a minimum.

The reaction is favoured both by negative DeltaH (favourable enthalpy, exothermic) and by positive DeltaS (increase in entropy). The most interesting cases are those where DeltaH and DeltaS are of the same sign, and pulling in different directions. Under these conditions, DeltaH is relatively most important at lower temperatures and DeltaS at higher temperatures.

Answer 2

the secret's the heavy metals Barium and Lead. maximum of their salts are insoluble and sort precipitates. The Barium occasion is very standard in that the salt precipitate is not any doubt one among the main insoluble ingredients time-honored, Barium sulfate. Balanced equations have equivalent numbers of atoms on the two facets, yet no longer constantly equivalent numbers of molecules. this would make the Barium equation: Ba(OH)2 + H2SO4 -> BaSO4 + 2H2O it is the reaction between an acid and a base, forming a salt and water. The Barium sulfate needs the subscript "(s)" to point that's a impressive. working chemists on no account use this nomenclature for the reason that's bulky. Lead acetate is probable Lead's maximum soluble salt. it is going to sort insoluble Lead carbonate: Pb(C2H3O2) + Na2CO3 -> PbCO3 + 2C2H3O2Na returned, each and every thing is "(aq)" different than the forged Lead carbonate. additionally word that 2 molecules of Sodium acetate sort. Balancing chemical equations is least puzzling while communities of atoms are dealt with a single unit. interior the Lead equation, a carbonate team is exchanged for a pair of acetate communities.

Answer 3

If ∆G < 0, reaction is spontaneous. ( ∆H < T∆S)
∆G > 0, reaction is non-spontaneous (∆H > T∆S)