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.
• B.
• C.
• D.

Answer 1

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 = $6.023\times {10}^{23}$ 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 =$6.023\times {10}^{23}$ ×12 atoms of carbon

So, 0.005moles of sugar will have,

0.005mole =$6.023\times {10}^{23}$ ×12×0.05 atoms of carbon

0.005mole =3.6×${10}^{22}$ atoms of carbon

So, the number of carbon atoms added is 3.6×${10}^{22}$.