chemistry HW

Chemistry 115

Activity 8a

Limiting Reagents

For the following reactions, find the following:

a) Which of the reagents is the limiting reagent?

b) What is the maximum amount of each product that can be formed?

c) How much of the other reagent is left over after the reaction is complete?

1) Consider the following reaction:

3 NH4NO3 + Na3PO4 ( (NH4)3PO4 + 3 NaNO3

Answer the questions above, assuming we started with 30 grams of ammonium nitrate and 50 grams of sodium phosphate.

2) Consider the following reaction:

3 CaCO3 + 2 FePO4 ( Ca3(PO4)2 + Fe2(CO3)3

Answer the questions at the top of this sheet, assuming we start with 100 grams of calcium carbonate and 45 grams of iron (III) phosphate.

Percent Yield

1) Write the equation for the reaction of iron (III) phosphate with sodium sulfate to make iron (III) sulfate and sodium phosphate.

2) If I perform this reaction with 25 grams of iron (III) phosphate and an excess of sodium sulfate, how many grams of iron (III) sulfate can I make?

3) If 18.5 grams of iron (III) sulfate are actually made when I do this reaction, what is my percent yield?

4) Is the answer from problem #3 reasonable? Explain.

5) If I do this reaction with 15 grams of sodium sulfate and get a 65.0% yield, how many grams of sodium phosphate will I make?