Name:  _____________________                              date:  __________________               period: _______

Ch.9 stochiometry                   test                               45 points                                  chemistry

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

If you use the online website,, or associated app, then clearly state that you used the website / app and you don’t have to show the algebraic manipulation to solve the problem.

If you didn’t use your calculator, but only used mental math, clearly state it; otherwise, you will be graded, where I assume that you used your calculator.

Academic Honesty:   The answers on this test / quiz are my own and I am using only the allowed set of notes as described in the syllabus and am only using a calculator or preceding website / app – I did not use any other website / app during the test / quiz.  I have not discussed the test questions with anyone during the test.  If you violate any of the preceding items or do not sign, your semester grade is a F.

                                                                                                Signature:  ___________________

1. Fill-in the blank, where the % yield is 75%.  [15 points]

a.  Excess Na3PO4  +  5.0 g Ca(NO3)2  -->   ___ g Ca3(PO4)2  +  NaNO3

b. 8.0 g lithium phosphate  +  9.0 g calcium chloride  -->  ___ g precipitate  [15 points]

3. Fill-in the blank  [15 points]

a. Excess N2  +  5.0 mole H2 -->  ___  mole NH3

b. Excess O2  +  5.0 g C2H6  -->  ___ mole CO2  +  H2O

c.  Excess Na3PO4  +  5.0 g Ba(NO3)2  -->   ___ g Ba3(PO4)2  +  NaNO3