Question

For a reaction between PCl3 and Cl2 to form PCl5, the units of Kc are: a.mol/dm³ b.mol-1/dm³ c.mol-¹dm³ d.moldm³​

Answer 1

Answer:1/mol dm-3

Explanation:

Mol dm-3/mol dm-3 mol dm-3

=1/mol dm-3

Answer 2

For a reaction between PCl3 and Cl2 to form PCl5, the units of Kc is mole⁻¹.dm³

• The Kc of any given reaction is defined as the ratio of the concentration of the product raised to the power of their stoichiometric coefficiets to the concentration of the reactants raised to the power of their stoichiometric coefficients.

• In this reaction one mole of PCl5 is formed from one mole each of PCl3 and Cl2,hence Kc = [PCl5]/[PCl3].[Cl2]

• Therefore, units of Kc equals (mole/dm3)/((mole/dm3)*(mole/dm3)) = mole⁻¹.dm³