Calculate the mass per cent of different elements present in sodium su

1.	Calculate the mass per cent of different elements present in sodium sulphate
Answer» Calculations:Mass% of an element in a compound is calculated using the relation,=\xa0{tex}\\frac{\\text { Mass of that element in the compound }}{\\text { Molar mass of the compound }} \\times{/tex}100\xa0Now the molar mass ofNa2SO4 = 2(23.0) + 32.0 + 4\xa0{tex}\\times{/tex} 16.0= 142 g mol-1So, Mass per cent of sodium=\xa0{tex}\\frac{46}{142} \\times{/tex}100= 32.39%Similarly,Mass per cent of sulphur=\xa0{tex}\\frac{32}{142} \\times{/tex}100= 22.54%Mass per cent of oxygen=\xa0{tex}\\frac{64}{142} \\times{/tex}100= 45.07%

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