Reference no: EM132688699

1. Iron and oxygen react to form iron(III) oxide according to the following balanced chemical equation. What is the limiting reactant in a mixture of 6.0 moles of Fe and 6.0 moles of O2?

4 Fe (s) + 3 O2 (g) → 2 Fe2O3 (s)

2. Consider the following balanced chemical equation where 20.0 g NH3 and 20.0 g CO2 are reacted. How many grams of urea (CH4N2O) are produced and what is the limiting reactant?

2 NH3 + CO2 → CH4N2O + H2O

How many grams of urea (CH4N2O) are produced?

(NH3 = 17.034 g/mole; CO2 = 44.01 g/mole; CH4N2O = 60.062 g/mole)

3. Limiting reactants with solutions. Consider mixing 25.00 mL of 0.500 M barium chloride solution with 25.00 mL of 0.500 M silver nitrate.

A. Write the balanced chemical equation with states (hint a precipitate is formed).

B. Using a limiting reactant approach, calculate the mass of silver chloride that will be formed (AgCl, 143.32 g/mol).

4. Consider mixing 25.00 mL of 0.125 M aluminum chloride solution with 25.00 mL of 0.100 M sodium hydroxide solution.

A. Write the balanced chemical equation with states (hint a precipitate is formed).

B. Using a limiting reactant approach, calculate the mass of aluminum hydroxide that will be formed (Al(OH)3, 78.01 g/mol).

Percent yield

1. A student synthesized aspirin in the laboratory. Using the amount of limiting reactant, she calculated the mass of aspirin that should form as 10.15 g. When she weighed her aspirin product on the balance, its mass was 8.95 g. What was the percent yield?

2. The reaction of lithium metal and water to form lithium hydroxide and hydrogen gas is represented by the following balanced chemical equation

2Li (s) + 2 H2O (l) → 2 LiOH (aq) + H2 (g)

When Li is mixed with excess water, 0.30 mol of H2 gas is isolated in the laboratory. If this reaction occurs to give an 85% yield of H2, now many moles of Li reacted?