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Problem 70 Hard Difficulty

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?


$\mathrm{n}\left(\mathrm{KNO}_{3}\right)=1415 \mathrm{mol}$
$\mathrm{m}=\mathrm{n}^{*} \mathrm{Mr}=142929,15 \mathrm{g}=1,43^{*} 10^{5} \mathrm{g}$


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Video Transcript

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