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Chemistry Question on Stoichiometry and Stoichiometric Calculations

What is the stoichiometric coefficient of CaCa in the reaction? Ca+Al3+→Ca2++AlCa + Al^{3+} \to Ca^{2+} + Al

A

22

B

11

C

33

D

44

Answer

33

Explanation

Solution

[Ca→Ca2++2e−]×3[Ca \to Ca^{2+}+2e^{-}]\times 3 [Al3++3e−→Al]×2][Al^{3+}+3e^{-}\to Al] \times 2] 3Ca→3Ca2++6e− 2Al3++6e−→2Al3Ca+2Al3+→3Ca2++2Al\frac{\begin{matrix}\begin{matrix}3Ca \to3Ca^{2+}+6e^{-}\\\ 2Al^{3+}+6e^{-} \to2Al\end{matrix}\end{matrix}}{3Ca+2Al^{3+}\to3Ca^{2+}+2Al} Therefore, the stoichiometric coefficient of Ca in the given reaction is 33