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Question

We have a pure H2SO4 sample and it contains a total of 1120 hydrogen atoms. Find the number of H2SO4 molecules present in the sample.

A
560
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B
2240
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C
1120
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D
1000
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Solution

The correct option is A 560
1 mole of H2SO4 contains 2 moles of H atoms.
So, 2 moles of H-atoms are present in 1 mole of H2SO4.
Again, 6.022×1023 H-atoms = 1 mole of H-atoms.
Therefore, 1120 H-atoms = 11206.022 × 1023 moles of H-atoms.
Hence, the number of H2SO4 molecules present in the sample
=11206.022 × 1023×12×6.022×1023=560

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