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Question

142 g of sodium sulphate (Na2SO4) has:

A
2 mole of Na2SO4
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B
12.044×1023 sodium ions
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C
1 mole of Na2SO4
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D
6.022×1023 sulphur atoms
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Solution

The correct options are
B 12.044×1023 sodium ions
C 1 mole of Na2SO4
D 6.022×1023 sulphur atoms
142g of Na2SO4=(23×2)+32+(16×4)
=46+32+64=142g
moles of Na2SO4=142142=1 mole of Na2SO4
1 moles of Na2SO4 contains 1 mole of S atoms and 2 moles of Na atoms
it contains 1×6.022×1023 atoms of S
and 2×6.022×1023 atoms of Na
12.044×1023 atoms of S

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