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Question

How many atoms are present in 1 kg of sugar?

A
7.92×1025 atoms
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B
6×1023 atoms
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C
6.022×1025 atoms
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D
1000 atoms
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Solution

The correct option is A 7.92×1025 atoms
Mass of 1 mol or (6.022×1023 molecules) of C12H22O11=12×12+22×1+11×16=342 g

Number of molecules in 1000 g C12H22O11=1000342×6.022×1023=17.61×1023

Number of atoms present in 1 molecule of C12H22O11=12+22+11=45

Number of atoms in 1000 g C12H22O11=45×17.61×1023

=792.45×1023=7.92×1025 atoms

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