Question

Calculate the molar mass of the following:

(i) H2O

(ii) CO2
​

(iii) CH4
​

Answer 1

i-water.

ii-carbondioxide.

iii-sodium.

Answer 2

Answer:

Explanation:

(i) Molar mass of water (H2 O)  

Atomic mass of H=1

Atomic mass of O=16

H 2 O=2×H+1×O

Molar mass of water=2×1+16=18g/mol

(ii) Molar mass of carbon dioxide (CO  

2

​

)

Atomic mass of C=12

Atomic mass of O=16

CO2

​

=1×C+2×O

Molar mass of CO2

​

=12+2×16=44g/mol

(iii) Molar mass of methane (CH 4 )

Atomic mass of C=12

Atomic mass of H=1