This system has an equilibrium constant of 50.5 at 448°c: h2(g) + i2(g) ↔ 2hi(g). what is the reaction quotient, q, for this system when [h2] = 0.200 m, [i2] = 0.100 m, and [hi] = 3.00 m?

For a general reaction:

Expression for reaction quotient is written as follows:

Here, [A], [B], [C] and [D] is concentration of A, B, C and D respectively and a, b , c and d is their respective stoichiometry.

The given reaction is as follows:

Thus, expression for reaction quotient will be:

Putting the values,

Therefore, the value of reaction quotient is 450.

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.