Q.
The mass per cent of different elements present in sodium sulphate, Na2SO4 respectively are
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a
32.37 ; 45.06 and 22.57
b
22.57 ;32.37 and 45.06
c
45.06 ; 32.37 and 40.06
d
32.37 ; 22.57 and 45.06
answer is D.
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Detailed Solution
Mass per cent of an element = = Mass of that element in the compound Molar mass of the compound ×100 Molar mass of Na2SO4 =(2×22.99)+32.06+(4×16.00) = 142.04 g Mass per cent of sodium =45.98×100142.04=32.37 Mass per cent of sulphur =32.06×100142.04=22.57 Mass per cent of oxygen =64×100142.04=45.06
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