onsider the chemical system: H2(g)+I2(g)------>2HI(g)

5.89 mol H2, 5.89 mol I2, and 11.8 mol HI are placed in a closed 10.00 L container maintained at 448°C. At equilibrium, the concentrations of H2, I2, and HI are 0.258 , 0.258 , and 1.84 M.

A. The ratio

[HI]2 / [H2][I2]

represents: ?

choose one or more:

1. the law of mass action.

2. the mass action expression.

3. the equilibrium constant expression.

4. the equilibrium constant.

5. none of these.

B. The value, 4.01 , represents: ?

choose one or more:

1. the law of mass action.

2. the mass action expression.

3. the equilibrium constant expression.

4. the equilibrium constant.

5. none of these.

C. The value, 50.9 , represents: ?

choose one or more:

1. the law of mass action.

2. the mass action expression.

3. the equilibrium constant expression.

4. the equilibrium constant.

5. none of these.

At a given temperature, the rate of a reaction at a particular instant is proportional to the product of the active masses of the reactants at that instant raised to powers which are numerically equal to the numbers of their respective molecules in the stoichiometric equation describe the reaction.