ΔS is positive for the reaction . a. C2H4 (g) + H2 (g) → C2H6 (g) b. Mg (s) + Cl2 (g) → MgCl2 (s) c. 2NO (g) + O2 (g) → 2NO2 (g) d. 2N2 (g) + 3H2 (g) → 2 NH3 (g) e. C3H8 (g) + 5 O2 (g) → 3CO2 (g) + 4 H2O (g)

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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