Ferrocene, synthesized in 1951 , was the first organic iron compound with Fe $-\mathrm{C}$ bonds. An understanding of the structure of ferrocene gave rise to new ideas about chemical bonding and ed to the preparation of many useful compounds. In the combustion analysis of ferrocene, which contains only $\mathrm{Fe}, \mathrm{C},$ and $\mathrm{H}, \mathrm{a}$ 0.9437 - g sample produced 2.233 $\mathrm{g}$ of $\mathrm{CO}_{2}$ and 0.457 $\mathrm{g}$ of $\mathrm{H}_{2} \mathrm{O}$ .

What is the empirical formula of ferrocene?

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\begin{array}{l}{\text { (a) mass, in grams, of } 1.50 \times 10^{-2} \text { mol CdS }} \\ {\text { (b) number of moles of } \mathrm{NH}_{4} \mathrm{Cl} \text { in } 86.6 \mathrm{g} \text { of this substance }} \\ {\text { (c) number of molecules in } 8.447 \times 10^{-2} \mathrm{mol} \mathrm{C}_{6} \mathrm{H}_{6}} \\ {\text { (d) number of } \mathrm{O} \text { atoms in } 6.25 \times 10^{-3} \mathrm{mol} \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3}}\end{array}

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\begin{array}{l}{\text { (a) mass, in grams, of } 0.105 \text { mol sucrose }\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)} \\ {\text { (b) moles of } \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2} \text { in } 143.50 \mathrm{g} \text { of this substance }} \\ {\text { (c) number of molecules in } 1.0 \times 10^{-6} \mathrm{mol} \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}} \\ \text { (d) number of }

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