The standard gibbs free energy of formation of is zero. (a) al (s) (b) br2 (l) (c) hg (l)

(a), (b) and (c)

Explanation:

The standard Gibbs free energy of formation of a compound is defined as the change of Gibbs free energy that occurs in the formation of 1 mole of a substance from its component elements in their standard states.

Based on this definition, elements in their standard state have a standard free energy of formation of zero.

Standard state of aluminium is Al(s), of bromine is Br₂(l) and for mercury is Hg(l). That means the free energy of formation is zero for (a), (b) and c.

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answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

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