What is the number of zinc atoms in a piece of zinc weighing 10 g ? (Atomic mass of Zn = 65 u)

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Solution

Mass of zinc = 10g
gram atomic mass of zinc = 65g
We know that one mole of zinc contains 6.022 × 10²³ atoms of zinc.
65g of zinc contain = 6.022 × 10²³ atoms
Therefore, 10g of zinc contain = 10 × 6.022 × 10²³/65 = 9.264 × 10²² atoms

Hence, 10 grams of zinc contain 9.264 × 10²² atoms.

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What is the number of zinc atoms in a piece of zinc weighing 10 g ? (Atomic mass of Zn = 65 u)

Mass of zinc = 10g gram atomic mass of zinc = 65g We know that one mole of zinc contains 6.022 × 1023 atoms of zinc. 65g of zinc contain = 6.022 × 1023 atoms Therefore, 10g of zinc contain = 10 × 6.022 × 1023/65 = 9.264 × 1022 atoms Hence, 10 grams of zinc contain 9.264 × 1022 atoms.