Question

For the reaction,

$2Cl\left(g\right)\to C{l}_2\left(g\right)$ what are the signs of $△$H and $△$S ?

Answer 1

∆H and ∆S are negative The given reaction represents the formation of chlorine molecule from chlorine atoms. Here, bond formation is taking place. Therefore, energy is being released. Hence, ∆H is negative.

Also, two moles of atoms have more randomness than one mole of a molecule. Since spontaneity is decreased, ∆S is negative for the given reaction.