Question

The partial pressure of $O_2$ in the gas collected is:

• A. $790mmHg$
• B. $770mmHg$
• C. $750mmHg$
• D. $730mmHg$

Answer 1

Answer: (D)

$\begin{array}{c}\text{Given,}2{KClO}_3\left(s\right)⟶2KCl\left(s\right)+3O_2\left(g\right)\\ \text{Here,}\begin{array}{cc}{P}_{\text{Total}}& =750mmHg\\ P_{H_{2}O}& =20mmHg.\end{array}\end{array}$

$\begin{array}{cc}{P}_{\text{Total}}& =P_{H_{2}O}+P_{O_2}\\ \therefore P{O}_2& =P_{Total}-P_{H_{2}O}\\ & =(750-20)mmHg\\ & =730mm\text{Hg.}\end{array}$

$\text{Hence, partial pressure of}{O}_2\text{collected at}$

${22}^{\circ }C=730mmHg$

Option D is correct answer