Question

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?
HELPPP

Answer 1

Just finished it... The answer is 450... Hope this helped.

Answer 2

For a general reaction:

$aA+bB\rightarrow cC+dD$

Expression for reaction quotient is written as follows:

$Q=\frac{[C]^{c}[D]^{d}}{[A]^{a}[B]^{b}}$

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:

$H_{2}(g)+I_{2}(g)\rightleftharpoons 2HI(g)$

Thus, expression for reaction quotient will be:

$Q=\frac{[HI]^{2}}{[H_{2}][I_{2}]}$

Putting the values,

$Q=\frac{(3.00 M)^{2}}{(0.200 M)(0.100 M)}=450$

Therefore, the value of reaction quotient is 450.