Saturday, 28 November 2020 07:55 AM
Molar mass of sucrose = 342 g
No. of oxygen atoms in 342 g of (C12?H22?O11?) =11×NA?
? No. of oxygen atoms in 3.42 g of (C12?H22?O11?) =34211×NA?×3.42? = 0.11NA?
No. of oxygen atoms in 18g of H2?O =1NA?
? Total no. of oxygen atoms in 3.42g of sucrose and 18g of water =0.11NA?+1NA?=1.11NA?=1.11×6.02×1023=6.68×1023.