1 Calculate the relative Molecular Mass of A) Water (H20 B) Carbon dioxide (CO2)
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Class 11>>Chemistry>>Some Basic Concepts of Chemistry>>Atomic and Molecular Masses>>Calculate the molar mass of the followin
Question
Calculate the molar mass of the followings:
(i) H2O
(ii) CO2
(iii) CH4
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Solution
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(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/mo
Answer:
Explanation:
Molecular formula of Water =H20
The atomic mass of Carbon =1
The atomic mass of Oxygen =16
Molecular mass =2× atomic mass of hydrogen + 1× atomic mass of oxygen.
=(2×1)+(1×16) = 2+16 = 18
Hence the relative molecular mass of water =18 g/mol
Molecular formula of carbon dioxide =CO2
The atomic mass of Carbon =12
The atomic mass of Oxygen =16
Molecular mass =1× atomic mass of carbon +2× atomic mass of oxygen.
=(1×12)+(2×16)=44
Hence the relative molecular mass of carbon dioxide =44 g/mol.