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 ?