ch. 6 & 9  moles & stoichiometry                  test   [50 points]          honors Chemistry

 

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

 

                                                                                                Signature:  ___________________

 

For problems involving calculations, show your work in an organized manner, include any relevant equation (or formula and conversion factor(s)), put the proper units in your calculations / answer, and have the proper number of significant figures in your answer. 

 

1.  Solve   [10 points]

 

a.  5.0 g C2H6 =  __  moles C2H6

 

b.  5.0 millimoles carbon dioxide =  ___ g carbon dioxide

 

 

2.  Determine the empirical formula of tin chloride, where   [15 points]

 

1.00 g tin chloride  +  excess silver nitrate  à  2.20 g silver chloride  +  tin nitrate


 

3.  Solve  [10 points]

 

              5.0 g C2H6  +  15.0 g O2  à  __ g H2O  +  CO2

 

 

4.    What is the % yield in the below reaction:  [15 points]

 

10.0 g  Ca(NO3)2  +  10.0 g Na3PO4  à  NaNO3  +  11.0 g Ca3(PO4)2