An inorganic salt gave the following per

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Target Exam

CUET

Subject

Chemistry

Chapter

Some Basic Concepts of Chemistry

Question:

An inorganic salt gave the following percentage composition:

Na = 23.11, S= 40.51 and O=30.38

Calculate the empirical formula of the salt.

Options:

Na₂SO₄

Na₂SO₃

Na₂S₂O₃

NaSO₄

Correct Answer:

Na₂S₂O₃

Explanation:

The correct answer is option 3. Na₂S₂O₃.

\(\text{Calculation of the empirical formula : }\)

Element	Symbol	Percentage of element	Atomic mass of the element	moles of the element =\(\frac{Percentage}{\text{Atomic mass}}\) \(\text{Ralative number of moles}\)	Simplest molar ratio	Simplest whole number molar ratio
Sodium	Na	29.11	23	\(\frac{29.11}{23}\text{ = 1.266}\)	\(\frac{1.266}{1.266}\text{ = 1}\)	2
Sulphur	S	40.51	32	\(\frac{40.51}{32}\text{ = 1.266}\)	\(\frac{1.266}{1.266}\text{ = 1}\)	2
Oxygen	O	16	16	\(\frac{30.38}{16}\text{ = 1.897}\)	\(\frac{1.89}{1.266}\text{ = 1.5}\)	3

∴ \(\text{The Empirical formula is =}Na_2S_2O_3\)