Question

$4$ g H${}_2$ and $127$ g I${}_2$ are mixed and heated in $10$ lit closed vessel until equilibrium is reached. If the equilibrium concentration of HI is $0.05$ M, the total number of moles presents at equilibrium is

• A. $3.25$
• B. $1.75$
• C. $2.25$
• D. $2.5$

Answer 1

The correct option is D $2.5$

$H_2+I_2\rightleftharpoons 2HI$

$4$g Hydrogen $\Rightarrow$ $2$moles

$127$g of $I_2\Rightarrow 0.5$moles

$H_2+I_2\rightleftharpoons 2HI$

initial $2$ $0.5$ $0$

equilib $2-x$ $0.5-x$ $2x$

total moles at equilibrium $=2.5$moles.