Question

A sample of table sugar has a mass of 5.432g a) calculate the number of moles in the sample

Answer 1

The number of particles of atoms depends on the ratio of their composition in the compound

Further explanation

Given

5.432 g of table sugar

Required

moles of sample

moles of C, H and O

number of atoms

Solution

Table sugar : Sucrose : C₁₂H₂₂O₁₁

• moles of sample :

= 5.432 : 342,3 g/mol

= 0.016

• moles of C, H, and O :

C = 12 x 0.016 = 0.192

H = 22 x 0.016 = 0.352

O = 11 x 0.016 = 0.176

• number of atoms :

C = 0.192 x 6.02 x 10²³ = 1.16 x 10²³

H = 0.352 x 6.02 x 10²³ = 2.12 x 10²³

O = 0.176 x 6.02 x 10²³ = 1.06 x 10²³