1. 1 mol of ethanol
C2H5OH (ethanol) – Molar mass
= 24 + 6 + 16
= 46
46 g of ethanol contains 1 × 6.023 × 1023 number of oxygen atoms.
2. 1 mol of formic acid.
HCOOH (formic acid) – Molar mass
= 2+12 + 32
= 46
46 g of HCOOH contains 2 × 6.023 × 1023 number of oxygen atoms.
3. 1 mol of H2 O
H2O (water) – Molar mass
= 2 + 16
= 18
18 g of water contains 1 × 6.023 × 1023 number of oxygen atoms.
∴ 1 mole of formic acid contains the greatest number of oxygen atoms.