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Question

Find the total number of moles of electrons present in 6.022×1018 H3PO4 molecules.

A
0.5 moles
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B
0.05 moles
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C
0.005 moles
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D
0.0005 moles
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Solution

The correct option is D 0.0005 moles
6.022×1018 H3PO4 molecules =6.022 × 10186.022 × 1023 moles =105 moles ofH3PO4
The number of electrons in one molecule of H3PO4=3+15+(8×4)=50electrons.
So, the number of moles of electrons in one mole of H3PO4=50 moles.
Therefore, the total number of moles of electrons in 105 moles of H3PO4 will be
=50×105 moles = 0.0005 moles

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