Question

a black dot used as a full stop at the end of a sentence has a mass of about one attogram. assuming that the dot is made up of carbon, calculate the approximately nuber of carbon atoms present in the dot ?​

Answer 1

Answer:

I microgram means 1 x 10>-6 gm

Now 12 gm carbon = 6.023 x 10>23 atoms

1 x 10> -6 gm = 6.023 x 10>23 / 12 x 1 x 10> -6

= 5.019 x 10 >16

Answer 2

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mass of carbon in the dot,

$\large\bold{1 \: attogram = {10}^{ - 18} g}$

gram atomic mass of carbon = 12g

12g carbon contain,

$\large\bold{6.022 \times {10}^{23} }$

atom of carbon.

•: $\large\bold{ {10}^{ - 18} g}$ of carbon will contain carbon atom,

$\large\bold{ = > \frac{6.022 \times {10}^{23} }{12} \times {10}^{ - 18} }$

$\large\bold{ = > 5.02 \times {10}^{4} atom}$

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