An inorganic salt given the following percentage composition: $N a = 29.11, S = 40.51$ and $O = 30.38$ . Determine the empirical formula of the salt.

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Solution

For this we make table as:

Element

%Composition

Atomic Mass

Molar Ratio

Simple Ratio

Na

29.11%

23

(29.11/23)

(1.266/1.266)=1 $\times$ 2=2

S

40.51%

32

(40.51/32)

(1.266/1.266)=1 $\times$ 2=2

O

30.38%

16

(30.38/16)

(1.898/1.266)=1.5 $\times$ 2=3

$∴$ Formula is $N a_{2} S_{2} O_{3}$

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Similar questions

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 =

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S =

32 g/mol,

O =

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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.

Q. 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?

Q. The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9 % phosphorus and 39 % oxygen. Find the empirical formula of the compound[Na = 23, P = 31, O = 16].

(a) Calculate the percentage of boron (B) in borax (Na₂B₄O₇·10H₂O). (H = 1, B = 11, O = 16, Na = 23).
(b) (i) The compound A has the following percentage composition by mass:
Carbon = 26.7%, oxygen = 71.1%, hydrogen = 2.2%. Determine the empirical formula of A (H = 1, C = 12, O = 16)
(ii) If the relative molecular mass of A is 90, what is the molecular formula of A?

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Element	%Composition	Atomic Mass	Molar Ratio	Simple Ratio
Na	29.11%	23	(29.11/23)	(1.266/1.266)=1 $\times$ 2=2
S	40.51%	32	(40.51/32)	(1.266/1.266)=1 $\times$ 2=2
O	30.38%	16	(30.38/16)	(1.898/1.266)=1.5 $\times$ 2=3

An inorganic salt given the following percentage composition:Na=29.11,S=40.51 and O=30.38. Determine the empirical formula of the salt.

For this we make table as: Element %Composition Atomic Mass Molar Ratio Simple Ratio Na 29.11% 23 (29.11/23) (1.266/1.266)=1×2=2 S 40.51% 32 (40.51/32) (1.266/1.266)=1×2=2 O 30.38% 16 (30.38/16) (1.898/1.266)=1.5×2=3 ∴ Formula is Na2S2O3

An inorganic salt given the following percentage composition: $N a = 29.11, S = 40.51$ and $O = 30.38$ . Determine the empirical formula of the salt.