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