Ch. 13 gas                    test       [60 points]

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.

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.

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1. At STP, 3.0 L N2 reacts with 8.0 L H2 to form  __ moles NH3 ?  [20 points]

2. Gas law problems.  [15 points]

3.  Solve for the pressure (in atm) in condition 2 under constant n & T

 Pressure (atm) Volume (mL) condition 1 1.0 24 condition 2 ? 15

4.  Solve for the volume (in mL) in condition 1 under constant n & P

 Volume (mL) Temperature (K) condition 1 ? 355 condition 2 235 675

5.  Solve for the volume (in mL) in condition 2 under constant n

 Pressure Volume (mL) Temperature (°C) condition 1 225 kPa 375 45 condition 2 0.75 atm ? 85

6. Solve.  [10 points]

a.225 kPa  =  ___ atm

b.  2.5 atm =  ___  torr

7.  A 12.5 L container at 37 °C has 25 mmoles of O2 and 5.0 mmoles of CO2.   [15 points]

a.  What is the partial pressure of CO2 ?

b.  What is the total pressure ?

c. What is the mole fraction of O2 ?