Question

I. Calculate the number of moles and
molecules of acetic acid present in 22 g
of it.​

Answer 1

Answer:

The number of moles is 0.367 and the number of molecules of acetic acid is 2.21× 10²³.

Explanation:

Acetic acid has the formulae as CH3COOH.

As we know, the number of moles = Mass/ Molar mass.

As the molar mass of acetic acid is 60g/mol ( by adding up the molar mass of carbon, hydrogen and oxygen as given in the chemical formula).

The given mass of acetic acid = 22g

Hence, the number of moles of acetic acid = 22/60 which is equivalent to 0.367

Also, we know that 1 mole of acetic acid contains = 6.022 × 10²³ molecules

Hence, the number of molecules in 0.367 moles of acetic acid = 6.022 × 10²³ ×0.367

which is equal to 2.21 × 10²³.

Answer 2

chemical formula of acetic acid is or

so, molecular mass of acetic acid = 2 × atomic mass of C + 4 × atomic mass of H + 2 × atomic mass of O

= 2 × 12 + 4 × 1 + 2 × 16

= 24 + 4 + 32

= 60g/mol

given mass of acetic acid = 22g

so, no of moles of acetic acid = given mass/molecular mass

= 22/60 ≈ 0.367

so, number of moles of acetic acid is 0.367mol

number of molecules in 0.367 mol of acetic acid = 6.022 × 10²³ × 0.367

= 2.21 × 10²³

hence, number of molecules of acetic acid is 2.21 × 10²³