Stoichiometry
excess
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2 atoms
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4 molecules
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The amount of each reactant of the reaction above is shown. It is obvious that there is too much oxygen. Two molecules of carbon dioxide will be formed and two molecules of oxygen gas will be left unreacted.
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2
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4
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6
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Which reactant is in excess?
Zinc
How much of the excess reactant will be left behind? 1 atom of zinc
How much hydrogen gas
will be formed?
3 hydrogen molecules
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2
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12
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8
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Which reactant is in excess?
calcium
How much of the excess reactant will be left behind? 8 atoms of calcium
How much hydrogen gas
will be formed?
4 hydrogen molecules
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2
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2
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12
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8
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Which reactant is in excess?
methane
How much of the excess reactant will be left behind? 8 molecules of
methane
How many water molecules
will be formed?
8 molecules
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2
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7
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4
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6
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12
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7
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Which reactant is in excess?
ethane
How much of the excess reactant will be left behind? 10 molecules of
ethane
How many water moleucles
will be formed?
6 molecules of water
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2
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2
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12
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8
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Which reactant is in excess?
carbon monoxide
How much of the excess reactant will be left behind? 8 molecules of
carbon monoxide
How much carbon dioxide
gas will be formed?
16 molecules of carbon dioxide