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Problem 71

Chromium(III) oxide reacts with hydrogen sulfide …

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Problem 70

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen:
$$
4 \mathrm{KNO}_{3}(s) \longrightarrow 2 \mathrm{K}_{2} \mathrm{O}(s)+2 \mathrm{N}_{2}(g)+5 \mathrm{O}_{2}(g)
$$
To produce 56.6 $\mathrm{kg}$ of oxygen, how many (a) moles of $\mathrm{KNO}_{3}$
and (b) grams of $\mathrm{KNO}_{3}$ must be heated?

Answer
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Chapter 3
Stoichiometry of Formulas and Equations
CHEMISTRY: The Molecular Nature of Matter and Change 2016

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