Question

The rate of formation of SO₃ in the following reaction: 2SO₂ + O₂¾® 2SO₃ is 10 g sec^–1. The rate of disappearance of O₂ will be -

• A. 5 g sec^–1
• B. 100 g sec^–1
• C. 20 g sec
• D. 2 g sec^–1

Answer 1

Answer: (D)

2 g sec^–1

Answer 2

2SO₂ + O₂ ¾® 2SO₃

$r_{SO_{3}}$= 10 gm/sec = $\frac{10}{80}$mol/sec

Also, $\frac{r_{O_{2}}}{1}$= $\frac{r_{SO_{3}}}{2}$ Ž $r_{O_{2}}$= $\frac{10}{80}$ × $\frac{1}{2}$mol/sec

= $\left( \frac{10}{160} \right)$ × 32 gm/sec

= 2 gm/sec