View the step-by-step solution to: a soild compound is a poor conductor of electricity. when

a soild compound is a poor conductor of electricity. when dissolved in water, it becomes a good conductor of electricty.
what type of chemical bonding would most likely be founded in this compound?

Chem 111
Quiz 5
Fall 2012
1. Draw the correct Lewis Structures of the following molecules and identify their
molecular geometry (2 pts each) (hint: check formal charges to identify the correct
a) CS2

b) CH2O
c) CCl3F
d) NO2Cl

2. Which of the following substances will exhibit dipole forces? (2 pts)

3. Freon-113, C2Cl3F3, has an enthalpy of vaporization of 27.04 kJ/mol and a normal boiling
point of 48°C. At what temperature is the vapor pressure of Freon-113 equal to 76.0 mm
Hg? (R = 8.31 J/K⋅ mol) (3 pts)

4. The phase diagram for CO2 has a triple point at –56.6 °C and 5.19 atm, and a critical point
at 31.0 °C and 73 atm. The solid and gas phases are in equilibrium at –78.7 °C and 1.00
atm. Which of the following statements regarding CO2 is/are CORRECT? (2 pts)
1. Sublimation occurs if the temperature of the solid phase is increased from –
79.0 °C to 0.0 °C at a constant pressure of 2.5 atm.
2. CO2 is a supercritical fluid at 55 °C and 75 atm.
3. At pressures greater than its critical pressure (73 atm), CO2 will not exist as a
solid at any temperature.
a. 1 only
b. 2 only

c. 3 only
d. 1 and 2
5. Determine the heat of reaction for the decomposition of one mole of benzene to acetylene
(2 pts)
C6H6(l) → 3C2H2(g)
given the following thermochemical equations:
2C6H6(l) + 15O2(g) → 12CO 2(g) + 6H2O(g)
∆ H = −6271 kJ
2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)
∆ H = −2511 kJ

6. Carbon and oxygen react to give carbon dioxide. The reaction of 4.49 g C(s) with 9.21 g
O2(g) releases −113.2 kJ of heat. What is the enthalpy of formation of CO2(g)? (2 pts)

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