Butane is burned in oxygen to yield CO2 and Water 2 C4H10 + 13O2 yields 8CO2 + 1

Question

Butane is burned in oxygen to yield CO2 and Water

2 C4H10 + 13O2  yields 8CO2 + 10 H2O

all reactands and products are gaseous except for water which is a liquid   Temp is 25 degrees C

Predict sign of delta S  (a)

What is sign of delta G for reaction?  How would sign and magnitude of delta G be affected by an increase in temperature to 50 degrees C (b)

What must be sign of delta H for reaction at 25C  How does total bond energy of reactants compare to that of products (c)

When reactants are placed together in a container no change is observed even though the reaction is known to be spontaneous. (d)

Explain  each answer

Explanation / Answer

a) Ds = - Ve because the entropy of reactents decreases

b) DG = DH - TDS

if DH > DS then DG is +Ve

   if DH < DS then DG is -Ve

c) it is a combution reaction so DH is -Ve

d) to initiate the reaction initially we must supply the energy

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