Step-by-step explanation:

(i) Molar mass of water (H

2

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

CO

2

=1×C+2×O

Molar mass of CO

2

=12+2×16=44g/mol

(iii) Molar mass of methane (CH

4

)

Atomic mass of C=12

Atomic mass of H=1

CH

4

=1×C+4×H

Molar mass of methane=12+4×1=16g/mol

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Verified answer

(i) Molar mass of water (H2O)

Atomic mass of H=1

Atomic mass of O=16

H2O=2×H+1×O

Molar mass of water=2×1+16=18g/mol

(ii) Molar mass of carbon dioxide (CO2 )

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 (CH4)

Atomic mass of C=12

Atomic mass of H=1

CH4 =1×C+4×H

Molar mass of methane=12+4×1=16g/mol

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