Enthalpy / entropy / free energy
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Calculate the standard reaction enthalpy, entropy and free energy at 298K for the following reactions:
a) CH3OH(l) + O2 (g) → CO2 (g) + H2O(l)
b) P(s,white) + O2 (g) → P4O10 (s)
c) sucrose + H2O (l) → α glucose + β fructose
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Solution Summary
Enthalpy, entropy and free energy is examined. Three chemical equations are examined.
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Solution:
The standard enthalpy of reaction (H0reaction) can be solved from the standard enthalpy of formation (H0f) of reactants and products following the equation:
H0reaction = nH0f of products - nH0f of reactants
Where n and m are coefficients of products and reactants respectively in the balanced equation
The standard enthalpy of formation (H0f) values are found in literatures.
Note:
H0f of an element in its standard state is zero.
Similarly, the standard entropy of reaction (S0reaction) can be solved from the standard molar entropy (S0) of reactants and products following the equation:
S0reaction = nS0 of products - nS0 of reactants
Hence,
1. 2CH3OH(l) + 3O2 (g) ...
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