Question

(a) What is meant by the 'molar mass' of a substance ? State the unit in which molar mass is usually expressed.
(b) Calculate the molar masses of the following substances. Write the results with proper units. (i) Ozone molecule, O3
(ii) Ethanoic acid, CH3COOH

Answer 1

Answer:

(a) Molar mass is the mass of the given molecule .gram is the SI unit

(b)i)O3 means it will have 3 oxygen molecules

so

16×3= 48g

ii)C=12

H=1x3

C=12

O=16

OH=1

adding all

=70g