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.Write equilibrium expressions for the following reversible reactions: \text { a. } 2 \mathrm{NO} 2(\mathrm{~g}) \leftrightarrow \mathrm{N} 2 \mathrm{O} 4(\mathrm{~g}) \text { b. N2 }(\mathrm{g})+3 \mathrm{H} 2(\mathrm{~g}) \leftrightarrow 2 \mathrm{NH} 3(\mathrm{~g}) \text { c. } 2 \mathrm{SO} 2(\mathrm{~g})+\mathrm{O} 2(\mathrm{~g}) \leftrightarrow 2 \mathrm{SO} 3(\mathrm{~g})

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