Question

mass of one atom of an element is 6.645×10-23 g. how many moles of an element are there in 0.320 kg.

Answer 1

Given condition
Mass of the atom = 6.645 × 10⁻²³ g.
Number of atoms = 1

Therefore, Atomic mass of the atom = 6.645 × 10²³ × Avogadro's number.
= 6.645 × 10⁻²³ × 6.022 × 10²³
= 40.02
≈ 40

Now,
Mass of some amount of the element = 0.32 kg = 320 g.

No of moles = 320 ÷ 40
= 8 moles.

Hope it helps.

Answer 2

Answer:

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