REVIEW  SHEET

 Mole Conversions, Stoichiometry,

Concentration of Solutions, Dilution Problems

 

Mole Conversions.   Use unit cancellation to set up and solve the following problems:

 

1.      11.5 grams of  Aluminum = __________ atoms of Aluminum.

 

 

 

2.      5.4 moles of HNO3 =  __________ grams.

 

 

 

3.      2.5 X 1020 molecules of KCl =  __________ grams.

 

 

 

4.      How many moles are contained in 419 grams of KC2H3O2?

 

 

 

5.      What will be the volume occupied by 450. Grams of  CH4  at STP?

 

 

 

6.      4.5 moles of  H2SO4 = __________  grams.

 

 

 

7.      Find the number of moles contained in 50. Grams of  Ca(OH)2.

 

 

 

 

 

 

Stoichiometric Calculations.   Use unit cancellation and show all work in solving the following:
 
1.  How much O2 will be produced by the decomposition of 450. Grams of KClO3?
 

2KClO3   -->  2KCl   +   3O2
 

 

 

2.      What volume of H2 gas, measured at STP, will be produced from the reaction of 435 grams of potassium:
 

2K  +  2H2O  -->   H2   +   2KOH
 

 

 

3.      How much Al(OH)3 is produced from 35 grams of Al2O3 and 35 grams of H2O?
 

A12O3  +  3H2O    -->    2A1(OH)3
 
 

 

Concentration of Solutions.  Show all work in solving the following:

 

1.      How much NaCl  is contained in 25 grams of a 15% solution?

 

 

 

2.      Explain in detail exactly how you would prepare a 3.5 M solution of  Mg(NO3)2.

 

 

 

3.  Find the Molar concentration of a solution containing 35 grams of KCl dissolved in 350. mL of solution.

 

 

4.      What volume of 3.5 M H2SO4 solution is needed in order to have 125 grams of H2SO4?

 

  

Dilution Problems:

 

1.      If you add 42 mL of water to 125 mL of a 6 M solution, what will be the new concentration?

 

 

2.    You are given 15 mL of a 3.5 M solution of AgNO3.  How much water will you have to add in order to have a

        1.25 M solution?