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Answer the following question.
Determine whether the following reaction is spontaneous under standard state conditions.
2H2O(l) + O2(g) → 2H2O2(l)
if ΔH° = 196 kJ, ΔS° = –126 J/K, does it have a cross-over temperature?
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Answer the following in one or two sentences.
Write the Arrhenius equation and explain the terms involved in it.
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Explain with the help of the Arrhenius equation, how do the rate of reaction changes with temperature.
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Answer the following in brief.
How will you determine activation energy graphically using the Arrhenius equation?
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Answer the following in brief.
Explain graphically the effect of temperature on the rate of reaction.
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Solve
The energy of activation for a first-order reaction is 104 kJ/mol. The rate constant at 25°C is 3.7 × 10–5 s –1. What is the rate constant at 30°C? (R = 8.314 J/K mol)
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Solve
What is the energy of activation of a reaction whose rate constant doubles when the temperature changes from 303 K to 313 K?
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The rate constant of a reaction at 500°C is 1.6 × 103 M−1 s−1. What is the frequency factor of the reaction if its activation energy is 56 kJ/mol?
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The rate constant for the first-order reaction is given by log10 k = 14.34 – 1.25 × 104 T. Calculate activation energy of the reaction.
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Solve
What fraction of molecules in a gas at 300 K collide with an energy equal to the activation energy of 50 kJ/mol?
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How will you determine activation energy from rate constants at two different temperatures?
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Explain with the help of the Arrhenius equation, how do the rate of reaction changes with activation energy.
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Write uses of sulphur.
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0.01 m aqueous formic acid solution freezes at – 0.021°C. Calculate its degree of dissociation, Kf = 1.86 K kg mol–1.
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Write the correct condition for spontaneity in terms of Gibbs energy.
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Draw labelled diagram of H2 – O2 fuel cell.
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Write two applications of fuel cells.
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Identify whether the following pair have larger entropy or not. If yes then Why?
He(g) in a volume of 1 L or He(g) in a volume of 5 L both at 25°C.
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Identify whether the following pair have a larger entropy or not. If yes then Why?
O2{g) at 1 atm or O2(g) at 10 atm both at the same temperature.
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Identify whether the following pair have a larger entropy or not. If yes then Why?
C2H5OH(l) or C2H5OH(g)
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