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Answer:
a) 
b) 
c) 
Explanation:
Hello,
In this case, in each reaction we must subtract the Gibbs free energy of formation the reactants to the Gibbs free energy of formation of the products considering each species stoichiometric coefficients. In such a way, the Gibbs free energy of formations are:

So we proceed as follows:
a)

b)

c)

Regards.
They have high melting and boiling points and are hard and brittle
Answer:
if you add a neutron to lithium-7 it becomes a compound nucleus of lithium-8