Question

CH4(g)+4Cl2(g) —>CCl4(l) + 4HCl(g) 2.calculate the standard molar enthalpy (delta H ) of the reaction 3.Explain...

CH4(g)+4Cl2(g) —>CCl4(l) + 4HCl(g)

2.calculate the standard molar enthalpy (delta H ) of the reaction

3.Explain if the reaction/process is always spontaneous,never spontaneous,or spontaneous only at high temperatures.(Hint: consider how delta H and deltaS influence delta G and spontaneity with the equation delta G =delta H -T deltaS )

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Answer #1

CH4(g)+4Cl2(g) —>CCl4(l) + 4HCl(g)

Hrex = Hf products - Hf reactants

            = 4*-92.31-135.4-(-74.8+4*0)

            = -429.84KJ/mole

Srex =Sf products - Sf reactants

            = 4*186.8+216.4 -(186.2+4*223)

           = -114.6J/mole   = -0.1146Kj/mole

G     = H-TS

           = -429.84-298*-0.1146

             = -395.69Kj/mole

G<0 is spontaneous reaction

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