A crystalline hydrated salt on being rendered anhydrous loses 45.6% of its weight.
The percentage composition of the anhydrous salt is:
$A l = 10.5 %, K = 15.1 %, S = 24.8 %$ and oxygen $= 49.6 %$
[Molar mass of $A l = 27, K = 39, S = 32$ ].

What is the empirical formula of the salt?

K_{2} A l S_{2} O_{7}

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K_{2} A l_{2} S_{2} O_{7}

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K A l S_{2} O_{8}

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K_{3} A l S_{2} O_{12}

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Solution

The correct option is C $K A l S_{2} O_{8}$
$\begin{matrix} Element & % & \frac{% mass}{Atomic mass} & Simplest ratio A l & 10.5 & \frac{10.5}{27} = 0.388 & 1 K & 15.1 & \frac{15.1}{39} = 0.387 & 1 S & 24.8 & \frac{24.8}{32} = 0.775 & 2 O & 49.6 & \frac{49.6}{16} = 3.1 & 8 \end{matrix}$

$∴$ Empirical formula = $K A l S_{2} O_{8}$

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Q. A crystalline hydrated salt on being rendered anhydrous, loses 45.6% of its weight. The percentage composition of anhydrous salt is : Al = 10.5%, K = 15.1%, S = 24.8% and I = 49.6%. Find the empirical formula of the salt.

A salt has the following percentage composition :

A l =

10.50%,

K =

15.1 %,

S =

24.8 % and the remaining oxygen. The empirical formula of the salt is:

(

A l =

27 g/mol,

K =

39 g/mol,

S =

32 g/mol,

O =

16 g/mol)

5g of crystalline salt rendered anhydrous; lost 1.8g of water. The formula weight of the anhydrous salts is 160. The number of water molecules of crystallization is:

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A crystalline hydrated salt on being rendered anhydrous loses 45.6% of its weight. The percentage composition of the anhydrous salt is: Al=10.5%, K=15.1%, S=24.8% and oxygen =49.6% [Molar mass of Al=27,K=39,S=32]. What is the empirical formula of the salt?

The correct option is C KAlS2O8Element%%massAtomic massSimplest ratioAl10.510.527=0.3881K15.115.139=0.3871S24.824.832=0.7752O49.649.616=3.18 ∴ Empirical formula = KAlS2O8

A crystalline hydrated salt on being rendered anhydrous loses 45.6% of its weight.
The percentage composition of the anhydrous salt is:
$A l = 10.5 %, K = 15.1 %, S = 24.8 %$ and oxygen $= 49.6 %$
[Molar mass of $A l = 27, K = 39, S = 32$ ].

What is the empirical formula of the salt?