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Calculate the mass percent of different elements present in sodium sulphate (Na2 SO4).

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Na2SO4 molecular wt is 142. Mass percentage of Na is 46/142×100= 32.39% Mass percentage of S is 32/142×100= 22.53% Mass percentage of O is 64/142×100= 45.07%
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mass % of Na= 32.39 mass % of S= 22.53 mass % of O= 45.07
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Molar mass of (Na2SO4) = = 142.066 Mass percent of sodium: 46.0*100/142.066 =32.379 = 32.4% Mass percent of sulphur:32.066*100/142.066 =22.57= 22.6% Mass percent of oxygen:64*100/142.066 =45.049 =45.05%
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