Question

For the reaction, $2SO_2 + O_2 <=> 2SO_3, $ the rate of disappearance of $O_2$ is $2 \times 10^{-4} \, mol \, L^{-1} \, s^{-1}$ . The rate of of appearance of $SO_3$ is

• A. $2 \times10^{-4}\, mol\, L^{-1}\,s^{-1}$
• B. $4 \times10^{-4} \, mol\, L^{-1}\,s^{-1}$
• C. $1 \times10^{-4} \,mol\, L^{-1}\,s^{-1}$
• D. $6 \times10^{-4} \,mol\, L^{-1}\,s^{-1}$

Answer 1

Answer: (B)

$\frac{\Delta [O_2]}{\Delta f} = 2 \times 10^{-4}$

$\frac{[SO_3]}{\Delta t} = 2 \frac{\Delta [O_2]}{\Delta t}$

$ = 2 \times 2 \times 10^{-4}$

$ = 4 \times 10^{-4} \,mol \, l^{-1} s^{-1}$