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Answer to Question #22039 in Other Chemistry for Collin Cundy

Question #22039
Calculate the grams of oxygen produced if 16.0 grams of lithium chlorate are completely decomposed by heating.
Expert's answer
The equation of this reaction is

2LiClO3 --> 2LiCl + 3O2
if lithium chlorate is 16.0 grams;
You can find the amount of substance:
n(LiClO3) = m(LiCl)/M(LiCl);
M(LiClO3) = 7+35.5 + 16 * 3 = 90.5 g/mol;
n(LiClO3) = 16 g / 90.5 g/mol = 0.18 moles
amounts of substances are related
n(LiClO3) : n(O2) = 2 : 3;
n(O2) = n(LiClO3) * 3 / 2 = 0.27 moles;
m(O2) = n(O2) * M(O2);
M(O2) = 16 * 2 = 32 g/mol;
m(O2) = 0.27 moles * 32 g/mol = 8.64 g;
So weight of oxygen is 8.64 g.

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