Chemistry - Mole Concept Question with Solution | TestHub

$3\mathrm{C}+2{\mathrm{Al}}_2{\mathrm{O}}_3⟶4\mathrm{Al}+3{\mathrm{CO}}_2$ (from bauxite) 4 moles of $\mathrm{Al}$ is produced by 3 moles of $\mathrm{C}$ 1 mole of $\mathrm{Al}$ is produced by $\frac{3}{4}$ mole of $\mathrm{C}$ $10^4$ moles of $\mathrm{Al}$ is produced by $\frac{3}{4}\times 10^4$ moles of $\mathrm{C}$ Amount of carbon used $\begin{array}{rl}& =\frac{3}{4}\times 10^4\times 12\mathrm{g}\\ & =90000\mathrm{g}=90\mathrm{kg}\end{array}$