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Question

If we have a pure Na2SO4 sample that contains a total of 7 billion electrons, then find the number of moles of Na2SO4 present in the sample.

A
1.66×1016 moles
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B
1.66×1014 moles
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C
3.66×1016 moles
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D
3.66×1014 moles
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Solution

The correct option is A 1.66×1016 moles
One molecule of Na2SO4 contains = (11×2)+16+(8×4)=70 electrons.
So, the number of electrons in 1 mole of Na2SO4=70×6.022×1023.
Therefore, 7×109 electrons will be present in
=7 × 10970 × 6.022 × 1023 moles of Na2SO4
=1.66×1016 moles of Na2SO4

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