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Question

A person adds 1.71 g of sugar in order to sweeten his tea. The number of C atoms added are (molar mass of sugar =342):


A
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B
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C
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D
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Solution

The correct option is A

Formula to determine the number of moles of sugar as follows:

mole = mass/molar mass

mole = 1.71/342= 0.005moles

the moles of the sugar added in the tea by the person is0.005.

According to the Avogadro number,

One mole of any substance = 6.023×1023 atoms

From the formula of sugar, it is clear that one mole of sugar has 12 carbon atoms.

One mole sugar =12 atoms

So, one mole of sugar has,

One mole =6.023×1023 ×12 atoms of carbon

So, 0.005moles of sugar will have,

0.005mole =6.023×1023 ×12×0.05 atoms of carbon

0.005mole =3.6×1022 atoms of carbon

So, the number of carbon atoms added is 3.6×1022.


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