Chemistry
Chemical Problems Based on Equations
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11
1. Phosphoric Acid is produced in the reaction between calcium phosphate and
sulfuric acid. How much of the phosphoric acid would be produced from 55 g of the
calcium phosphate? What other product is forrned and in what mass quantity?
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2. Phosphine , PH3, is formed when calcium phosphide is added to water. How
many grams of phosphine can be obtained from 200.0 g of calcium phosphide? The
other product is calcium hydroxide- how many grams of calcium hydroxide are
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3. Coke will reduce hot atsenous oxide to pure arsenic (Asa). How m"drSq-kq will be
required to completely reduce 500.0 kg of the oxide? How much arsenic is recovered
from this reaction? The othe_r- producl is C?.
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4. How much iron will be req{rired'to ielEafel
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antimony trisulfide? How much antimony is recovered
in this reaction. What is the
other product obtained? t , ')",
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5. Sodium tetfaborate is produced according to the following reaction:
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How much boric acid is needed to make 150 kg of sodium tetraborate?
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6. Calcium oxide can be prepared by heating calcium in oxygen. How much calcium
would be needed to make 15,0 g of calcium oxide in this way?
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7.Ifthecalciumoxidewerepreparedbyheatingcalcium'
the carbonate would be required to produce the 15.0 g of the oxide. The other
product is carbon dioxide.
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8. If the calcium oxide were to be obtained by the heating of calcium hydroxide, how
much of the hydroxide would be needed to obtain the 15.0 g? The other product is
water in this reaction.
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If the 15.0 g of calcium oxide in the above problems was allowed to react with
water, what amount of calcium hydroxide would be produced?
9.
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