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# Chemical Equilibrium

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Calculate Keq for the following (equilibrium concentrations given below substances)

a) 2 O3 (g) &#8596; 3 O2 (g) + heat
[6.0 x 10-1] [0.21]

b) 2 CO2 (g) + heat &#8596; 2 CO (g) + O2 (g)
[0.103] [0.024] [1.18 x 10-2]

c) NO2 (g) + O2 (g) + heat &#8596; NO (g) + O3 (g)
[0.072] [0.083] 6.73 x 10-2] [6.73 x 10-2]

2. For all three of the equilibria in problem #1 predict (1) how Keq is affected by an increase in temperature, (2) predict how the equilibrium will shift when pressure is decreased, (3) predict how the equilibrium will shift when the concentration of the underlined substance is increased, and (4) predict how the equilibrium will shift when the temperature is decreased.

Next set 4.5

How many grams of CO2 would be formed from 30 grams of C4H10 in the following reaction?
Be sure to balance the reaction before proceeding.
C4H10 + O2 &#8594; CO2 + H2O

4. How many moles of Ca3(PO4)2 would be formed from 40 grams of Ca in the following equation? Be sure to balance the reaction before proceeding.
Ca + H3PO4 &#8594; Ca3(PO4)2 + H2

A gas sample has an original volume of 760 ml when collected at 720 mm and 25oC. What will be the volume of the gas sample if the pressure increases to 820 mm and the temperature increases to 40oC?

6. A gas sample has an original volume of 450 ml when collected at 730 mm and 25oC. If a change is made in the gas temperature which causes the volume of the gas sample to become 620 ml at 1.00 atm, what is the new temperature?

7. A sample of CO2 gas which weighs 1.25 grams has a volume of 1.15 liters when collected at 35oC. What would be the pressure of the gas sample?