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JH
Numerade Educator

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Problem 3 Medium Difficulty

Balance the following equations:
(a) $\operatorname{Cr}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \longrightarrow \mathrm{Cr}_{2} \mathrm{O}_{3}(\mathrm{s})$
(b) $\mathrm{Cu}_{2} \mathrm{S}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \longrightarrow \mathrm{Cu}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{g})$
(c) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}(\ell)+\mathrm{O}_{2}(\mathrm{g}) \longrightarrow \mathrm{H}_{2} \mathrm{O}(\ell)+\mathrm{CO}_{2}(\mathrm{g})$

Answer

a. $4 \operatorname{Cr}(s)+3 O_{2}(g) \rightarrow 2 C r_{2} O_{3}$
b. $C u_{2} S(s)+O_{2}(g) \rightarrow 2 C u(s)+S O_{2}(g)$
c. $C_{6} H_{5} C H_{3}(l)+9 O_{2}(g) \rightarrow 4 H_{2} O(l)+7 C O_{2}(g)$

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