Mass of an atom of an element is 6.645x10-23 g.how many moles of the element are there in 0.320kg
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krishnal6347
11.06.2018
Chemistry
Secondary School
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Mass of one atom of an element is 6.645 x 10⁻²³ g. How many moles of element are there in 0.320 kg.
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Given conditions ⇒
Mass of the 1 atom of the element = 6.645 × 10⁻²³ g.
No. of atoms = 1.
Using the Formula,
No. of atoms = Mass/Atomic mass × Avo. Number.
1 = (6.645 × 10⁻²³)/Atomic Mass × 6.022 × 10²³
∴ Atomic Mass = 6.645 × 6.022
= 40.01619 g.
= 40.02 g.
≈ 40 g.
Now,
Mass = 0.320 kg.
= 320 g.
∵ No. of moles = Mass/Atomic Mass.
= 320/40.
= 8 moles.
Hence the number of moles of atoms is 8 .