1.Given the Following Reaction: C3H8 + 5 O2 3 CO2 + 4 H2O

Chemistry 121Oregon State University

Worksheet 8Dr. Richard L Nafshun

1.Given the following reaction: C3H8 + 5 O2  3 CO2 + 4 H2O

Assume that 10.00 g of propane react with excess oxygen. Calculate:

(A) the number of moles of propane that react;

(B) the number of molecules of propane that react;

(D) the number of grams of carbon dioxide and water that are formed;

(E) the number of molecules of carbon dioxide and water that are formed;

(F) the number of moles, grams and molecules of oxygen that are used up.

(G) a student collects 23.50 grams of CO2. What is the percent yield?

2.Calculate the molarity of the following aqueous solutions.

(A)6.00 mol HCl in 2.50 L of solution.

(B)45.00 grams NaOH in 10.00 L of solution.

3.How many grams of NaOH are required to prepare 50.0 mL of 0.125 molar NaOH?

4.(A) What is the percent composition of Na, S and O in the compound Na2SO4?

(B) What is the percent composition of Ca, N and O in the compound Ca(NO3)2?

5.Given the following reaction: C3H8 + 5 O2  3 CO2 + 4 H2O

Assume that 88.22 g of propane react with excess oxygen. Calculate:

(A) the number of moles of propane that react;

(B) the number of molecules of propane that react;

(D) the number of grams of carbon dioxide and water that are formed;

(E) the number of molecules of carbon dioxide and water that are formed;

(F) the number of moles, grams and molecules of oxygen that are used up.

(G) a student collects 55.90 grams of CO2. What is the percent yield?

6.Balance:C11H24 + O2  CO2 + H2O

How many moles of water are produced if four moles of C11H24 are consumed?

7.Balance:Li + O2 Li2O

How many moles of Li2O are produced if eight moles of Li are consumed?

8.Determine the mass percent composition of lithium sulfate.

9.20.5 g NaCl are dissolved in 500.0 mL of total solution. Calc M.

10.2.50 L of 2.00 M NaF solution is diluted to 4.00 L what is the molarity of the resulting solution?

Abbreviated Solubility Rules (see Table 4.1—Page 128 when working ChemSkill Builder):

Rule 1:All nitrates, group 1A metal salts and ammonium salts are soluble.

Rule 2:All carbonates, hydroxides, phosphates and sulfides are insoluble.

Rule 3:Rule 1 always takes precedent. Example: NaOH is soluble.

1.A student places 15.00 grams of solid sodium sulfate into a 500.00-mL volumetric flask and fills to the mark with water. Draw a picture of the ions in solution (similar to Figure 4.2—Page 125; but rather than label the ions as (+) and (-), label the ions with the chemical formula. Calculate the number of sodium ions present. Calculate the number of sulfate ions present. Write a balanced equation for the dissociation of the solid ionic compound.

2.List three strong acids and show how they exist in water (in other words, show a reaction for each that shows them dissociate).

3.Draw the structure of propanoic acid (CH3CH2COOH) and carefully show how it exists in water (in other words, show a reaction that shows it dissociate).