Mole Concepts
By now you should be able to do a number of things with a mole.  We recently revisited the mole and used it in many of the types of problems featured here.  Use you book for reference when you are stumped on a problem.  There are examples throughout.  Use dimensional analysis to demonstrate how units cancel.  You may work in small groups, but show all work.

 

1.  How many atoms are in a 2.4 moles of Fe?
 
 

2.  How many moles would 42.2 grams of oxygen equal?
 
 
 

3.  What is the molecular weight of elemental chlorine? (Hint: There's something kind of unique about chlorine.)
 
 
 

4.  How much would 3.6 moles of NaCl weigh?
 
 
 
 

5.  How many molecules are in 64.3 grams of water?
 
 
 
 

6.  If you react 3 moles of hydrogen gas with oxygen, how many moles of water will you get.  Write the balanced reaction equation.
 
 
 
 
 

7.  For the reaction 2 Mg + O2 -> 2 MgO we did in the crucible at the beginning of the semester, say you burned 15.3 g of  magnesium.  How much would the product weigh?
 
 
 
 
 

8.  Balance the following equation:  ____ C6H12O6  +  _____O2   ->  ____CO2
 +  _____H2O
 
 

9.  If you had 3 liters of an 8.0 molar solution of salt water, how many moles of salt would remain if the water was removed (boiled away)?
 
 
 

10.  You want to neutralize .33 L of 1.0 M HCl solution.  There is a container of 4.0 M NaOH solution in the lab.  How much of the basic solution should you use to completely neutralize the acid.  Further, should you use a little bit more, just to be sure you got it all?
 
 
 
 
 
 

11.  How many moles of salt will the reaction above yield?  (This problem has a number of steps -all of which you have attempted in the previous problems- but show all  your work so you can demonstrate mastery even if the final answer is incorrect due to mathematical error).
 
 
 


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