What are the units of $K_c$ for the reaction H$_2$(g) + I$_2$(g) ⇌ 2HI(g)?
Amol$^{-1}$ dm$^3$
Bmol$^2$ dm$^{-6}$
Cno unitsCORRECT
Dmol dm$^{-3}$
JUPEBChemistryChemical Equilibrium
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Why the answer is C, and why the others tempt you.
The numerator has (mol dm$^{-3}$)$^2$ and the denominator (mol dm$^{-3}$)(mol dm$^{-3}$), so the units cancel completely. $K_c$ has units only when the total powers on top and bottom differ.
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