Question

how many atoms in total are present in 1kg of sugar

Answer 1

Molar mass of the Sugar = 342 g/mole.

Mass = 1 kg. = 1000 g.

∴ No. of moles = 1000/342

= 2.92 moles.

∵ No. of molecules = No. of moles × Avogadro's number.

∴ No. of molecules = 2.92 × 6.022 × 10²³

= 17.58 × 10²³ molecules.

No. of atoms in 1 molecules of Sugar(C₁₂H₂₂O₁₁) = 12 + 22 + 11

= 45

∴ Total number of atoms in 1 kg of sugar = 45 × 17.58 × 10²³

= 791.29 × 10²³

= 7.913 × 10²⁵ atoms.

Hope it helps.