NSEC | 2024Chemical EquilibriumMedium
Question
An ideal-gas reaction equilibrium is represented as A + B ⇌ C + D. Considering the fact that all components are ideal and that only A and B are present initially, which of the following options is ALWAYS true at equilibrium ? 'N' is the number of moles of the species.
Options
A.[NC = NA]
B.
[NC + ND = NA + NB]
C.[NC = ND]
D.
[NA
= NB]
Solution
Sol. [Key Concept: Starting from no products, the amounts of products formed follow their stoichiometric coefficients regardless of the initial reactant ratio.]
In contrast, nA = nB requires equal initial reactant amounts. Equality of a product amount with a reactant amount, or equality of the total product and reactant amounts, requires additional conditions not supplied. Therefore only C is always true.
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