The unit f Kc or the system N2O4 g ----------- 2NO2 g
Correct answer: C. mole dm-3
- A. dimension (i.e., with no unit)
- B. mole dm3
- C. mole dm-3
- D. mole2 dm3
Explanation
The correct unit for the reaction N2O4 g → 2NO2 g is mole dm-3, as it represents the concentration of the substances involved in the reaction. This unit accounts for the balanced equation and the stoichiometry of the reaction. The other options are incorrect because they either wrongly assume no unit, combine units incorrectly, or misapply the units based on the reaction's stoichiometry.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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