1. Consider the equation 2KOH + H2SO4 → K2SO4 + 2H2O a) If 25g H2SO4 is reacted with 7.7g KOH, how many grams of K2SO4 are produced? b) For part (a) of this problem, identify the limiting reactant and calculate the mass of excess reactant that remains after the reaction is completed. c) Calculate the theoretical yield of the reaction. How many grams of material would you expect to obtain if the reaction has a 47.2% yield?
Topic: Mole concept
1. Consider the equation
2KOH + H2SO4 → K2SO4 + 2H2O
a) If 25g H2SO4 is reacted with 7.7g KOH, how many grams of K2SO4 are produced?
b) For part (a) of this problem, identify the limiting reactant and calculate the mass of excess reactant that
remains after the reaction is completed.
c) Calculate the theoretical yield of the reaction. How many grams of material would you expect to obtain if the
reaction has a 47.2% yield?
2. Phenol, commonly known as carbolic acid, was used by Joseph Lister as an antiseptic for surgery in 1865. Its
principal use today is in the manufacture of phenolic resins and plastics. Combustion of 5.23 mg of phenol yields
14.67 mg CO2 and 3.01 mg H2O. Phenol contains only C, H, and O. What is the per-centage of each element in
this substance?
3. Adipic acid is used in the manufacture of nylon. The composition of the acid is 49.3% C, 6.9% H, and 43.8%
O (by mass), and the molecular mass is 146 amu. What is the mole-cular formula?
Topic:
4. Hydrogen sulfide is oxidized by chlorine in aqueous solution.
H2S(aq) Cl2(aq) → S(s) 2HCl(aq)
The experimental rate law is
Rate ═ k[H2S][Cl2]
What is the reaction order with respect to H2S? with respect to
Cl2? What is the overall order?
5. The following data were collected for the reaction A(g) + B(g) → Products.
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