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Answers (Ex. 6)

Answers to Practice Problems

Here are the balanced equations and the answers to the questions.

4 K + O2 rtarrow.gif (850 bytes) 2 K2O
a. 0.56 moles K x 1 mole O2
4 moles K		 = 0.14 mole O2
b. 7.6 g K2O x   1 mole O2  
188.4 g K2O		 = 0.040 mole O2
c. 0.50 g K x 188.4 g K2O
   156.4 g K		 = 0.60 g K2O

 

Na2O + H2O rtarrow.gif (850 bytes) 2 NaOH
d. 12.4 g Na2O x 80.0 g NaOH
62.0 g Na2O		 = 16.0 g NaOH
e. 1000. g NaOH x  1 mole Na2O 
80.0 g NaOH		 = 12.5 mole Na2O

 

C + 2 H2 rtarrow.gif (850 bytes) CH4
f. 7.0 g H2 x 1 mole CH4 
   4.0 g H2		 = 1.75 moles CH4 = 1.8 moles CH4
g. 5.0 g C x  4.0 g H2 
12.0 g C		 = 1.7 g H2

Make sure that you resolve any problems you might have had with these questions before moving on to the next topic.

 

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