Answer to Question #298535 in General Chemistry for Jusber

Question

A reversible reaction of methanol (M) dehydrogenation to formaldehyde (F) and hydrogen (H):

CH₃OH ⇄ CH₂O + H₂

is characterized by an equilibrium constant K_C = 10 at a temperature t = 670°C. Given the following values of standard molar entropies:

S^⦵_M = 239,9 J/(mol·K)

S^⦵_F = 218,9 J/(mol·K)

S^⦵_H = 130,7 J/(mol·K)

Calculate the value of standard enthalpy of this reaction (∆H^⦵_R)

Universal gas constant R = 8,314 J/(mol·K)

Answer 1

The standard enthalpy of the universal gas constant

239,9 j/(mol.k) +218,9J/( mol.k) -130.7 J/(mol.k)

Ans: -3281