Law of mass action determines
Correct answer: B. Composition of reacting substances and products
- A. Only products
- B. Composition of reacting substances and products
- C. Only reacting substances
- D. None of the above
Explanation
The law of mass action is a fundamental principle that relates the concentrations of reactants and products in a chemical reaction at equilibrium. It is a part of chemical equilibrium theory.The law of mass action states that the rate of a chemical reaction is directly proportional to the product of the masses (concentrations) of the reacting substances, each raised to the power of its coefficient in the balanced chemical equation. It is expressed mathematically as:Rate=k⋅[A]m⋅[B]nwhere:● [A] and [B] are the concentrations of reactants A and B,● m and n are the coefficients of A and B in the balanced equation,● k is the rate constant.Therefore, the law of mass action helps determine the composition of both reacting substances and products in a chemical reaction
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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