Potassium selenate is isomorphous with potassium sulphate and contains 50.5 % of Se. Find the atomic weight of Se.

Question

Potassium selenate is isomorphous with potassium sulphate and contains 50.5 % of Se. Find the atomic weight of Se. (A) 142 (B) 71 (C) 47.33 (D) 284

Tardigrade Admin · Accepted Answer

K 2 SO 4 and K 2 SeO 4 are isomorphous. K 2 SeO 4 ⇒ 39 × 2+x+64=142+x (142+x) g text of K 2 SeO 4 ⇒ x g text of Se 100 g text of K 2 SeO 4 ⇒ (x/14+x) × 100 ∴ (x/142+x) × 100=50 ∴ x=142

Q. Potassium selenate is isomorphous with potassium sulphate and contains $50.5%$ of Se. Find the atomic weight of $S e$ .

142

71

47.33

284

$K_{2} S O_{4}$ and $K_{2} S e O_{4}$ are isomorphous.
$K_{2} S e O_{4}$
$\Rightarrow 39 \times 2 + x + 64 = 142 + x$
$(142 + x) g of K_{2} S e O_{4} \Rightarrow xg of S e$
$100 g of K_{2} S e O_{4} \Rightarrow \frac{x}{14 + x} \times 100$
$∴ \frac{x}{142 + x} \times 100 = 50$
$∴ x = 142$

Q. Potassium selenate is isomorphous with potassium sulphate and contains 50.5% of Se. Find the atomic weight of Se.

142

71

47.33

284

K2​SO4​ and K2​SeO4​ are isomorphous. K2​SeO4​ ⇒39×2+x+64=142+x (142+x)gof K2​SeO4​⇒xg of Se 100g of K2​SeO4​⇒14+xx​×100 ∴142+xx​×100=50 ∴x=142

Q. Potassium selenate is isomorphous with potassium sulphate and contains $50.5%$ of Se. Find the atomic weight of $S e$ .

$K_{2} S O_{4}$ and $K_{2} S e O_{4}$ are isomorphous.
$K_{2} S e O_{4}$
$\Rightarrow 39 \times 2 + x + 64 = 142 + x$
$(142 + x) g of K_{2} S e O_{4} \Rightarrow xg of S e$
$100 g of K_{2} S e O_{4} \Rightarrow \frac{x}{14 + x} \times 100$
$∴ \frac{x}{142 + x} \times 100 = 50$
$∴ x = 142$