Question #0a3ea

1 Answer
Taha Z.
Sep 8, 2017

1.51⋅1024 atoms

Explanation:

1 mole of a molecule contains Avogadro's number of molecules.

Where,
Avogadro's number =6.02⋅1023

So one mole of CH4 contains 6.02⋅1023 molecules of CH4

Half a mole would contain half the amount that a mole contain,

In 0.5 mole of CH4, there is 6.02⋅10232=3.01⋅1023

But one molecule of CH4 contains 5 atoms (1 atom of carbon and 4 atoms of Hydrogen).

So number of atoms in 0.5 mole of CH4 is equal to number of molecules in 0.5 mol multiplied by 5.
number of atoms in 0.5 mole of CH_4=5⋅number of molecules in 0.5 mol=5⋅3.01⋅1023=15.05⋅1023=1.505⋅1024≈1.51⋅1024

Hope that this will help. :)

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