Question

E. A student used a carbon pencil to write
his homework. The mass of this was
found to be 5 mg. With the help of this
calculate.
a. The number of moles of carbon in his
homework writing.
(Ans : 4.16 x 104)
b. no. of atoms in carbon
​

Answer 1

Explanation:

Mass of carbon found = 5 mg = 0.005 g

1 mol of Carbon = 12 g

Therefore,

0.005 g = 0.005 / 12

==> 0.000416

==> 4.16 × 10^-4. moles

Therefore,

No. of atoms = (No. of moles) × (Avogadro's constant)

==> (4.16 × 10^-4) × (6.022×10^23)

==> 25.051 × 10^-19

==> 2.505 × 10^-18 Atoms

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