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hem. 110.002
ssignment #3
JE 11/15/2017
1. Determine the oxidation state of Sulfur in (a) sulfur dioxide; (b) Sodium sulfide; (c)
Calcium sulfate.
2. A balloon is partly inflated with 5.00 liters of helium at sea level where the atmospheric
pressure is 1008 mb. The balloon ascends to an altitude of 3000 meters where the
pressure is 855 mb. What is the volume of the helium in the balloon? Assume that the
temperature of the gas in the balloon does not change in the ascent.
3. Label on aerosol cans caution against incineration because the can will explode when
pressures inside them exceed 3 atm. At what temperature (in Celsius degrees) will the
pressure inside an aerosol can which is 2.20 atm above ambient at 25 °C, reach 3.00 atm?
4. Oxygen generators in some airplanes are based on a chemical reaction between sodium
chlorate and iron: NaClO3(s) + Fe(s) O2(g) + NaCl(s) + FeO(s).
How many grams of NaClO3 would be needed to produce 120 liters of O2 at 1.00 atm and
20 °C?
5. Vent pipes at solid waste landfills often emit foul-smelling gases. A sample of such gas
is found to have a density of 0.65 /L at 25 °C and 757 mm Hg. What is the average)
molar mass of the gas?
6. Calculate how much faster than nitrogen will helium effuse through a balloon?
7. Studies of photosynthesis in green plants often make use of 'CO2. Calculate the relative
rate of diffusion of CO2 and
"?CO2. Specify which gas diffuses faster?
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Chemistry
1. Calculate the oxidation state of sulphur in:
a) SO2
S + -2 x 2 = 0
S = 4 (Oxidation state = 4)
b) Na2S
2x1+S=0
S = -2 (Oxidation state = -2)
c) CaSO4
2 x 1 + S + 4 x -2 = 0
2+S–8=0
S = 6 (Oxidation state = 6)
2. Volume of helium in the balloon
P1V1 = P2V2
P1 = 1008, V1 = 5, P2 = 855, V2 = ?
V2 = (1008 x 5)/855
= 5.89L
3. Temperature of aerosol
Bo...
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