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Chemistry · Some Basic Concepts of Chemistry
हिन्दीWhat is the mass per cent of oxygen in sodium sulphate (\( \text{Na}_2\text{SO}_4 \))? (Atomic masses: \( \text{Na} = 23, \text{S} = 32, \text{O} = 16 \))
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Correct answer · Option A
45.07%
Explanation
Molar mass of \( \text{Na}_2\text{SO}_4 = 142\text{ g mol}^{-1} \). Mass per cent of O = \( \frac{64}{142} \times 100 = 45.07\% \).
