# cws1

Balancing Chemical equations questions

For each of these reactions, students would need to write the balanced chemical equation, and then use stoichiometry to determine the amount (in grams) of the desired product that would be formed based on the given mass of reactants. For example, for the first reaction, the balanced chemical equation is:

NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)

Using the molar mass of silver chloride (AgCl), students could calculate the number of moles of AgCl produced, and then convert that to grams using the molar mass. The mass of silver chloride formed would be:

m(AgCl) = moles of AgCl x molar mass of AgCl

m(AgCl) = (mass of AgNO3 / molar mass of AgNO3) x (1 mole AgCl / 1 mole AgNO3) x (molar mass of AgCl)

m(AgCl) = (70.00 g / 169.87 g/mol) x (1 mol AgCl / 1 mol AgNO3) x (143.32 g/mol)

m(AgCl) = 41.76 g (rounded to 4 significant figures)

Therefore, the mass of silver chloride formed in this reaction would be 41.76 g.

1. A solution of hydrochloric acid (75.0 g) is mixed with solid magnesium. What is the mass of magnesium chloride formed?

2. Solid potassium (25.0 g) reacts with water to produce potassium hydroxide and hydrogen gas. What is the mass of potassium hydroxide formed?

3. Aqueous sodium hydroxide (60.0 g) is added to a solution of copper(II) sulfate pentahydrate. What is the mass of solid copper(II) hydroxide formed?

4. A solution of sulfuric acid reacts with solid calcium hydroxide (18.0 g). What is the mass of calcium sulfate formed?

5. A solution of nitric acid is mixed with solid aluminium (10.0 g). What is the mass of aluminium nitrate formed?

Limiting reagent

1. Aqueous solutions of sodium chloride (50.00 g) and silver nitrate (70.00 g) are mixed. What is the mass of silver chloride formed?

2. A solution of barium chloride (25.00 g) is added to a solution of sulfuric acid (40.00 g). What is the mass of barium sulfate formed?

3. Aqueous solutions of potassium iodide (20.00 g) and lead(II) nitrate (60.00 g) are combined. What is the mass of lead(II) iodide formed?

4. A solution of copper(II) sulfate (30.00 g) is mixed with a solution of sodium hydroxide (35.00 g). What is the mass of copper(II) hydroxide formed?

5. Aqueous solutions of iron(III) chloride (50.00 g) and sodium hydroxide (25.00 g) are reacted. What is the mass of iron(III) hydroxide formed?