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1. If the concentration of toluene vapor in a polluted air is 92 ppm, how would that number change if we raise the temperature by 10 oC? If the concentration of toluene vapor is 92g/L how would the number change if we raise the temperature by 10 oC (at a constant pressure of 1 atm)? (1pt)

 

The concentration of Toluine would decrease according to Lechateliars principle in both cases.

 

 

• How much (in mg) lead (Pb) and cadmium (Cd) are in 1 kg of contaminated soil if the concentrations of Pb and Cd are 350 ppb and 5.6 g/g, respectively? (1pt)

1ppb = 1 g

350 ppb = 350 g of Pb in 1kg of soil

Therefore there are 0.35 mg in 1kg of soil

 

5.6 g of Cd are in 1 g of soil

There are 5600g of Cd in 1 kg of soil

Therefore, there are 5.6mg of Cd in 1kg of soil.

 

• The average surface temperature of the earth is about 15 o Convert that to oF, oK,and

oR. (1pt)

[°F] = [°C] × 9⁄5 + 32