Ch. 9 & 13 stochiometry & gas  test                                                   conceptual / Chem

For problems involving calculations, show the relevant equation (or formula and conversion factor(s)), show your work in an organized manner, put the proper units in your calculations / answer, and have the proper number of significant figures in your answer.  [40 points]

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:  ___________________

 
1.  A syringe with a volume of 35 mL has a pressure of 95 kPa at 22 °C.  The volume of the syringe was reduced to 25 mL and its temperature to –5 °C.  What is the pressure in the syringe ?  [10 points]

2.  solve for  __.  [10 points]

a.  375 kPa  =  __  mm Hg

b.  1.25 atm  =  __  torr

3.  5.0 grams of H₂ gas reacts with 35 grams of N₂ gas to produce  __ grams of NH₃ .  [10 points]

4.   How many grams of water would be formed in the reaction:

            CH₃ OH  +  O2  -->   CO₂   +  H₂ O
                 2.0 g     excess                  # g = ?