You visited us 1 times! Enjoying our articles? Unlock Full Access!

Preparations and Reactions of Sodium Oxide

A is a binary...

Question

$A$ is a binary compound of a univalent metal. When $1.422 g$ of $A$ reacts completely with $0.321 g$ of sulphur in an evacuated and sealed tube, $1.743 g$ of a white crystalline solid $B$ produces, which produces a hydrated double salt $C$ with $A l_{2} (S O_{4})_{3}$ . Identify $A, B,$ and $C$ .

Open in App

Solution

Alum has $A l_{2} (S O_{4})_{3}$ and $M_{2} S O_{4}$ .
$0.321 g$ sulphur $\Rightarrow 1.743 g$ of metal sulphate
$32.1 g$ sulphur $\Rightarrow \frac{1.743}{0.321} \times 32.1 = 174.3 g$ metal sulphate
For $M_{2} S O_{4}$ ,
$2 M + 32 + 64 = 174.3$
or $M = 39$ .
Which is the atomic mass of $K$ .
$B$ is $K_{2} S O_{4}$
$C$ is $K_{2} S O_{4} \cdot A l_{2} (S O_{4})_{3} \cdot 24 H_{2} O$
The formula $K_{2} S O_{4}$ shows that $S$ has reacted with $2$ mol of
$K O_{2}$ .
$2 K O_{2} + S \to K_{2} S O_{4}$
$0.321 g$ sulphur $\Rightarrow 1.422 g$ of metal oxide.
$32.1$ sulphur $\Rightarrow \frac{1.422}{0.321} \times 32.1 = 142.2$ metal oxide
For $2 K O_{2}$
Mass $= 2 (39 + 32) = 142$
$C$ is $K O_{2}$

Suggest Corrections

Similar questions

A l_{2} (S O_{4})_{3}

{A l}_{2} ({S O}_{4})_{3}

K O_{2}

K_{2} S O_{4}

K_{2} S O_{4} . A l_{2} (S O_{4})_{2} a l u m . 24 H_{2} O

A l_{2} (S O_{4})_{3}

K O_{2}

K_{2} S O_{4}

K_{2} S O_{4} . A l_{2} (S O_{4})_{3} . 24 H_{2} O

C_{4} H_{10} O

C_{4} H_{8}

C_{4} H_{8}

C_{4} H_{9} O H

H_{2} S O_{4}

M n O_{2}

A g N O_{3}

Join BYJU'S Learning Program