Sabtu, 01 Agustus 2009

STOICHIOMETRY PROBLEMS

1.Write down the molecular equation and ionic equation, then state the name of the products.
a.A solution of barium hydroxide reacts with hydrochloric acid
b.Acetic acid reacts with a solution of sodium hydroxide.
c.Sulfuric acid reacts with a solution of ammonia.
d.Calcium oxide reacts with hydrochloric acid.
e.Carbon dioxide is added to calcium hydroxide solution.
f.Hydrochloric acid is added to calcium.
g.Dilluted sulfuric acid is added to magnesium.
h.Concentrated of sulfuric acid is added to iron.
i.Dilluted nitric acid is added to zink.
j.Concentrated nitric acid is added to silver.
k.A solution of silver nitrate reacts with a solution of table salt produces a precipitate.
l.A solution of ammonium chloride is added to a solution of sodium hydroxide, a gas will be produced.

2.Hydrochloric acid is added to 1,3 grams of zink (Ar 65). If molarity of acid is 3 mol/L, answer the following questions.
a.Write down the molecular equation and the ionic equation.
b.Determine the minimum volume of acid needed in this reaction.
c. Calculate the gas produced at:
1)STP
2)1 atm and 27 degree's celcius
3)the same T and P with nitrogen gas that its mass of 1 L is 2 grams.
d.If zink used is 80% from its ore, calculate the mass of ore used.

3.An aliage contains 90% of aluminium (Ar 27) and 10% of cuprum (Ar 63,5) is used to produce hydrogen gas. Hydrochloric acid is added to this aliage and produces 6,72 L gas at STP.
a.Write down the molecular equation and ionic equation.
b.Calculate the mass of aliage.
c.If the minimum volume of acid used is 200 mL, predict the molarity of this acid.

4.A mol of metal, M reacts with sulfuric acid 2M, produced 33,6 L hydrogen gas at STP. Answer the questions below.
a.Determine the formula of salt produced.
b.Determine the oxidation number of M.
c.Write down the molecular equation and ionic equation.
d.Calculate the minimum volume of acid needed.

5.FeS(Mr=88)is reacted with hydrochloric acid according to the following reaction:
FeS(s)+2HCL(aq) → FeCl2(aq)+H2S(g)
If this reaction produced 8 L of H2S gas, and at the same T and P, 1 mol of H2S gas = 20 L, answer the questions below.
a.Write down the ionic equation.
b.Calculate the mass of FeS.
c.If an ore contains 70,4% FeS, calculate the mass of ore.
d.The acid used is 4M. Determine the minimum volume of acid needed.

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