The reduction of peroxy disulphate ion by I-ion is expressed by S 2 O 82-+3 I - longrightarrow 2 SO 42-+ I 3-. If rate of disappearance of I -is 9 / 2 × 10-3 mol lit -1 s -1, what is the rate of formation of 2 SO 42- during same time?

Question

The reduction of peroxy disulphate ion by I-ion is expressed by S 2 O 82-+3 I - longrightarrow 2 SO 42-+ I 3-. If rate of disappearance of I -is 9 / 2 × 10-3 mol lit -1 s -1, what is the rate of formation of 2 SO 42- during same time? (A) 3 × 10-3 mol Lit-1 s-1 (B) 2 × 10-3 mol Lit-1 s-1 (C) 10-3 mol Lit-1 s-1 (D) 4 × 10-3 mol Lit-1 s-1

Tardigrade Admin · Accepted Answer

(1/2) (d[S O42-]/d t)=(1/3)(-(d(I-)/d t)) (1/2) × (d[S O42-]/d t)=(1/3) × (9/2) × 10-3 ∴ (d[S O42]/d t)=3 × 10-3 mol Lit -1 s -1

Q. The reduction of peroxy disulphate ion by $I^{-}$ ion is expressed by $S_{2} O_{8}^{2 -} + 3 I^{-} ⟶ 2 S O_{4}^{2 -} + I_{3}^{-}$ . If rate of disappearance of $I^{-}$ is $9/2 \times 1 0^{- 3} m o l l i t^{- 1} s^{- 1}$ , what is the rate of formation of $2 S O_{4}^{2 -}$ during same time?

$3 \times 1 0^{- 3} m o l L i t^{- 1} s^{- 1}$

$2 \times 1 0^{- 3} m o l L i t^{- 1} s^{- 1}$

$1 0^{- 3} m o l L i t^{- 1} s^{- 1}$

$4 \times 1 0^{- 3} m o l L i t^{- 1} s^{- 1}$

$\frac{1}{2} \frac{d [ S O _{4}^{2 -} ]}{d t} = \frac{1}{3} (- \frac{d ( I ^{-} )}{d t})$
$\frac{1}{2} \times \frac{d [ S O _{4}^{2 -} ]}{d t} = \frac{1}{3} \times \frac{9}{2} \times 1 0^{- 3}$
$∴ \frac{d [ S O _{4}^{2} ]}{d t} = 3 \times 1 0^{- 3} m o l L i t^{- 1} s^{- 1}$

Q. The reduction of peroxy disulphate ion by I−ion is expressed by S2​O82−​+3I−⟶2SO42−​+I3−​. If rate of disappearance of I−is 9/2×10−3mollit−1s−1, what is the rate of formation of 2SO42−​ during same time?

3×10−3molLit−1s−1

2×10−3molLit−1s−1

10−3molLit−1s−1

4×10−3molLit−1s−1