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Question

Calculate the total number of electrons present in a pure sample of H2SO4, if 5 moles of oxygen are present in the sample.

A
1.51×1026
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B
3.76×1026
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C
1.51×1025
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D
3.76×1025
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Solution

The correct option is D 3.76×1025
From the formula unit of H2SO4,
4 moles of O-atoms are present in 1 mole of H2SO4. Therefore, 5 moles of O-atom will be present in 54 moles of H2SO4.

The total number of electrons in one formula unit of H2SO4=1×2+16+8×4=50

The total number of electrons in one mole of H2SO4=50×6.022×1023

Therefore, the total number of electrons in 54 moles of H2SO4
=50×6.022×1023×52
=3.76×1025

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