Calculate the molar mass of the following : (i) H_(2)O (ii) CO_(2) (iii) CH_(4)

Calculate the molar mass of the following : (i) H_(2)O (ii) CO_(2)

1.	Calculate the molar mass of the following : (i) H_(2)O (ii) CO_(2) (iii) CH_(4)
Answer» Solution :Molecular MOLAR mass is the SUM of atomic mass of all atoms in compound. Molar mass of `H=1.0079 u` Molar mass of `O=16.00u` Molar mass of `C=12.01 u` (i) Molar mass of `H_(2)O = 2 xx "atomic mass of H" + 1 xx "atomic mass of O"` `=2xx1.0079 u + 1 xx 10.00u` `=18.0158u` (ii) Molar mass of `CO_(2) = 1 xx "atomic mass of C" + 2 xx "atomic mass of O"` `= 1 xx 12.01 u + 2 xx 16.00 u` `= 44.01u` Molar mass of `CH_(4) = 1 xx "atomic mass of C" + 4 xx "atomic mass of H" ` `= 1 xx 12.01u + 4 xx 1.0079u` `=16.0416u`