DDT, an insecticide harmful to fish, birds and humans, is produced by the following reaction 2C6H5Cl + C2HOCl3 → C14H9Cl5 + H2O Chlorobenzene Chloral DDT In a government lab, 1142 g chlorobenzene is reacted with 485 g of chloral. a) What mass of DDT is formed? b) Which reactant is limiting? Which is in excess? c) What mass of the excess reactant is left over? d) If the actual yield of DDT is 200 g, what is the percent yield?
1. DDT, an insecticide harmful to fish, birds and humans, is produced by the following
reaction
2C6H5Cl + C2HOCl3 → C14H9Cl5 + H2O
Chlorobenzene Chloral DDT
In a government lab, 1142 g chlorobenzene is reacted with 485 g of chloral.
a) What mass of DDT is formed?
b) Which reactant is limiting? Which is in excess?
c) What mass of the excess reactant is left over?
d) If the actual yield of DDT is 200 g, what is the percent yield?
2. An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an
isotope with mass 205.9745 amu, 22.10% of an isotope with mass 207.9766 amu.
Calculate the
3. Calculate the concentration of all ions present in each of the following solutions of
strong electrolytes
a) 0.100 mol of Ca(NO3)2 in 100 mL of solution
b) 2.5 mol Na2SO4 in 1.28 M of solution
c) 4.00 g K3PO4 in 150.0 mL of solution
4. A balloon is filled to a volume of 6.00 x 102 mL at a temperature of 19.0oC . The
balloon is then cooled at constant pressure to a temperature of 100 K. What is the
final volume of the balloon?
5. If 14.0 g AgNO3 is available, what volume of 0.27 M AgNO3 can be prepared?
6. Maleic acid is an organic compound composed of 41.39% C, 3.47% H, and the rest
oxygen. If 0.129 mol maleic acid has a mass of 15.0 g, what are the empirical and
molecular formulas of maleic acid?
7. An 13.6 L sample of gas is determined to contain 0.80 mol Ar. At the same
temperature and pressure, how many moles of gas would there be in a 45L sample?
8. Write the balanced formula, complete ionic, and net ionic equations for each of the
following acid-base reactions.
a) HNO3(aq) + Al(OH)3(S) →
b) HC2H3O2 (aq) + KOH(aq) →
9. Balance each of the following
a) Cl2(g) + Al (s) → Al3+ (aq) + Cl-(aq)
b) MnO-4(aq) + Pb2+ (aq) → Mn2+(aq) + Pb4+(aq)
10. Balance the oxidation-reduction reaction in basic solution
Br2(g) + Sn (s) → Sn2+ (aq) + Br-(aq)
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