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NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

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Question : 1 of 36
Marks: +1, -0
Calculate the molecular mass of the following :
(i) H2OH_2O
(ii) CO2CO_2
(iii) CH4CH_4
Solution:  
(i) The molecular mass of H2OH_2O = 1 × 2 + 16 = 18 amu or 18 u
(ii) The molecular mass of CO2CO_2 = 12 + 2 × 16 = 12 + 32 = 44 amu or 44 u
(iii) The molecular mass of CH4CH_4 = 12 + 1 × 4 = 12 + 4 = 16 amu or 16 u
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