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Exam 3 with Answer Key - General Chemistry I | CHEM 1110, Exams of Chemistry

Material Type: Exam; Professor: Condon; Class: General Chemistry I; Subject: Chemistry; University: Roane State Community College; Term: Fall 2003;

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

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CHEM 1110 test 3 for fall 2003 Page 1
Do not write on this test. Enter your answers by filling in the bubbles on the answer sheet.
1 atm / 760 torr R = 0.08206 L atm mol K
-1 -1
STP
V = 22.4 L mol
!1
°C A
T/K = t /°C + 273.15 N = 6.022 × 1023
Temperature in °C versus Water Vapor Pressure in torr
0°C 4.6 torr 10°C 9.2 torr 20°C 17.5 torr
1°C 4.9 torr 11°C 9.8 torr 21°C 18.7 torr
2°C 5.3 torr 12°C 10.5 torr 22°C 19.8 torr
3°C 5.7 torr 13°C 11.2 torr 23°C 21.1 torr
4°C 6.1 torr 14°C 12.0 torr 24°C 22.4 torr
5°C 6.5 torr 15°C 12.8 torr 25°C 23.8 torr
6°C 7.0 torr 16°C 13.6 torr 26°C 25.2 torr
7°C 7.5 torr 17°C 14.5 torr 27°C 26.7 torr
8°C 8.0 torr 18°C 15.5 torr 28°C 28.3 torr
9°C 8.6 torr 19°C 16.5 torr 29°C 30.0 torr
Compound Name Temperature °C for the pressures:
1 torr 10 torr 40 torr 100 torr 400 torr 760 torr
Methanol -44.0 -16.2 +5.0 +21.6 +49.9 +64.7
Carbon disulfide -73.9 -44.7 -22.5 -5.1 + 28.0 +46.5
Acetic acid -17.2 +17.5 +43.0 +63.0 +99.0 +118.1
Ethanol -31.3 - 2.3 +19.0 + 34.9 + 63.5 + 78.4
Propanone -59.4 -31.1 - 9.4 + 7.7 + 39.5 + 56.5
1-propanol -15.0 +14.7 +36.4 + 52.8 + 82.0 + 97.8
2-propanol -26.1 + 2.4 +23.8 + 39.5 + 67.8 + 82.5
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1 atm / 760 torr R = 0.08206 L atm mol -1^ K-1 V STP = 22.4 L mol!^1 T/K = t°C /°C + 273.15 NA = 6.022 × 10^23 Temperature in °C versus Water Vapor Pressure in torr 0°C 4.6 torr 10°C 9.2 torr 20°C 17.5 torr 1°C 4.9 torr 11°C 9.8 torr 21°C 18.7 torr 2°C 5.3 torr 12°C 10.5 torr 22°C 19.8 torr 3°C 5.7 torr 13°C 11.2 torr 23°C 21.1 torr 4°C 6.1 torr 14°C 12.0 torr 24°C 22.4 torr 5°C 6.5 torr 15°C 12.8 torr 25°C 23.8 torr 6°C 7.0 torr 16°C 13.6 torr 26°C 25.2 torr 7°C 7.5 torr 17°C 14.5 torr 27°C 26.7 torr 8°C 8.0 torr 18°C 15.5 torr 28°C 28.3 torr 9°C 8.6 torr 19°C 16.5 torr 29°C 30.0 torr Compound Name Temperature °C for the pressures: 1 torr 10 torr 40 torr 100 torr 400 torr 760 torr Methanol -44.0 -16.2 +5.0 +21.6 +49.9 +64. Carbon disulfide -73.9 -44.7 -22.5 -5.1 + 28.0 +46. Acetic acid -17.2 +17.5 +43.0 +63.0 +99.0 +118. Ethanol -31.3 - 2.3 +19.0 + 34.9 + 63.5 + 78. Propanone -59.4 -31.1 - 9.4 + 7.7 + 39.5 + 56. 1-propanol -15.0 +14.7 +36.4 + 52.8 + 82.0 + 97. 2-propanol -26.1 + 2.4 +23.8 + 39.5 + 67.8 + 82.

  1. In the Dumas method the flask used was 265.5 mL, the atmospheric pressure was 745.5 torr, the mass of the flask empty (with lid, etc.) was 102.0522 g and the mass at the end of the experiment was 103.1522 g. (The boiling bath was at 100.0°C) What is the molar mass of the liquid unknown? a. 1320 g mol!^1 b. 129.3 g mol!^1 c. 60.0 g mol!^1 d. 90.0 g mol!^1 e. 1.0 g mol!^1
  2. In a freezing point depression experiment to find molar mass of an unknown non-electrolyte, the freezing point was lower by 1.981°C. 9.892 grams of this unknown was dissolved in 101.210 g of water to make up the solution measured. What was the molar mass of the unknown? ( K f = 1.86°C kg mol!^1 ) a. 60.0 g mol!^1 b. 131 g mol!^1 c. 1320 g mol!^1 d. 2.5 g mol!^1 e. 91.8 g mol!^1
  3. What is the ratio of the diffusion speed of argon compared to helium? a. 0.316 b. 3.16 c. 10.0 d. 0.100 e. 0.
  4. What is the pressure of 4.00 mole of an ideal gas contained in a 2.00 L volume at 100°C? a. 101 atm b. 51 atm c. 16.4 atm d. 203 atm e. 8.2 atm
  5. The pressure of hydrogen in a leak tight rigid container is initially 5.00 psi at 25°C. If the temperature is increased to 300°C, what would be the resultant pressure? a. 9.61 psi b. 60 psi c. 0.42 psi d. 2.60 psi e. 15.0 psi
  6. How many moles of helium is contained in a 50 L container at STP? a. 1120 mol b. 0.45 mol c. 25 mol d. 2.2 mol e. 5.2 mol
  7. Calculate the pressure generated if a container of gas initially at 500 torr and a volume of 25.0 quarts is compressed to a volume of 10.0 quarts. a. 500 torr b. 1250 torr c. 200 torr d. 400 torr e. 0.50 torr
  8. Using the data in the table above, calculate the ) H v for ethanol between 19°C and 35°C. a. 32.5 kJ mol!^1 b. 61.5 kJ mol!^1 c. 42.8 kJ mol!^1 d. 423 J mol!^1 e. 21.4 kJ mol!^1

a. 23.8 torr b. 21.6 torr c. 0.953 torr d. 0.909 torr e. 22.7 torr

  1. What is the correct order for the freezing points for the following: a. lowest = Xe < Kr < Ar < Ne < He = highest b. lowest = He < Kr < Ar < Ne < Xe = highest c. lowest = He < Ar < Kr < Ne < Xe = highest d. lowest = He < Ne < Ar < Kr < Xe = highest e. lowest = He < Ar < Ne < Kr < Xe = highest
  2. Which one of the following groups consists entirely of strong electrolytes? a. CaCl , Fe(OH) , HCl 2 3 b. NaCH COOH, NH , NaCl 3 3 c. CH OH, NaCl, HCl 3 d. CH COOH, NH Cl, Mg(OH) 3 4 2 e. NaCl, HClO , RbOH 3
  3. Which of the following is the (net) ionic reaction corresponding to the overall reaction: AgNO (aq) + NaCl(aq) 3! NaNO (aq) + AgCl(s) 3 a. AgNO + Na b. Ag + Cl+ 3 !∫ AgCl +^ ∫ Ag + NaNO+ 3 c. Ag + NaCl+^ ∫ Na + AgCl+ d. NO 3!^ + Na +∫ NaNO 3 e. AgNO + Cl 3!^ ∫ AgCl + NO 3!
  4. In the reaction: CH + 2O 4 2! CO + 2H O how many liters at 300°C of H O at 1 atm are 2 2 2 produced if 2.0 L of CH at STP are burned? 4 a. 4.2 L b. 8.4 c. 2.1 L d. 5.5 L e. 12.0 L
  5. What is the volume of 2.0 mol of an ideal gas at 0°C and 1.0 atm pressure? a. 56 L b. 5.6 L c. 11.2 L d. 22.4 L e. 44.8 L

KEY

1.b 2.e 3.a 4.d 5.a 6.d 7.b 8.c 9.e 10.a 11.b 12.e 13.e 14.a 15.b 16.d 17.e 18.b 19.a 20.e