267. During the dissociation of orthosilicic acid, 5 processes can be considered
H4SiO4 = 4H SiO44-, ΔH(a)
H4SiO4 = H H3SiO4-, ΔH(b)
H3SiO4- = H H2SiO42-, ΔH(c)
H2SiO42- = H HSiO43-, ΔH(g)
HSiO4 = H SiO44-, ΔH(d)

How, using Hess's law, to determine the thermal effect 4. ΔH(g).

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