Chemistry 211 Larson Babb Quiz

2/12/01

Name ______________________

1. If .002 mol of Pb⁺² (aq) is added to a solution containing .003 mol of I^- (aq), a precipitate of PbI₂(s) forms.

a) Write a balanced chemical reaction equation for this process.

b) How many moles of PbI₂(s) are formed?

c) Which reagent is the limiting reagent?

d) Which reagent is in excess? How much in excess i.e. how many moles are left unreacted?

2. 2 g of H₂ are reacted with 20 g of N₂ by the reaction:

3 H₂ + N₂ = 2 NH₃

How many grams of ammonia, NH₃, are produced?

3. 2.45 g of Na₂CO₃ is dissolved in 450 mL of water.

a) What is the reaction equation that describes this process.

b) What is the molarity of Na₂CO₃ in this solution?

c) What is the formula and concentration of each solute species in this solution?

4. Write the reaction equation of the basic oxide MgO with water.

5. What is the oxidation state of the underlined elements in the followin ions or compounds:

a) BrO₃^-

b) CaH₂

c) SO₄^-2