Determine whether the reactions listed below are entropy-favored or disfavored u

Question

Determine whether the reactions listed below are entropy-favored or disfavored under standard conditions. Predict how an increase in temperature will affect the value of delta G.
c) SiCl4 (g) + 2 H2O (l) => SiO2 (s) + 4 HCl (g)
d) P4 (s, white) + 6 H2 (g) => 4 PH3 (g)
Determine whether the reactions listed below are entropy-favored or disfavored under standard conditions. Predict how an increase in temperature will affect the value of delta G.
c) SiCl4 (g) + 2 H2O (l) => SiO2 (s) + 4 HCl (g)
d) P4 (s, white) + 6 H2 (g) => 4 PH3 (g)
Determine whether the reactions listed below are entropy-favored or disfavored under standard conditions. Predict how an increase in temperature will affect the value of delta G.
c) SiCl4 (g) + 2 H2O (l) => SiO2 (s) + 4 HCl (g)
d) P4 (s, white) + 6 H2 (g) => 4 PH3 (g)

Explanation / Answer

c) SiCl4 (g) + 2 H2O (l) => SiO2 (s) + 4 HCl (g)

entropy favoured .

moles reactants = 1

moles of product = 4

moles number is on product side more so entropy increases the reaction is favoured towards entropy increase side.

note : pure solids and liquids moles does not count

d)

P4 (s, white) + 6 H2 (g) => 4 PH3 (g)

entropy disfavoured

reactant moles = 6

product moles = 4

number moles are decreasing . so disorder decreases if disorder decreases that reaction is entropy disfavoured

for first reaction temperature increases dG value decreases

for second reaction temperature increases dG also increases

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