(i) H2O:
The molar mass of one hydrogen atom is approximately 1.008 g/mol, and the molar mass of one oxygen atom is approximately 15.999 g/mol. Therefore, the molar mass of one water molecule (H2O) is:
2(1.008 g/mol) + 15.999 g/mol = 18.015 g/mol
(ii) CO2: The molar mass of one carbon atom is approximately 12.011 g/mol, and the molar mass of two oxygen atoms is approximately 2(15.999 g/mol) = 31.998 g/mol. Therefore, the molar mass of one carbon dioxide molecule (CO2) is:
12.011 g/mol + 31.998 g/mol = 44.009 g/mol
(iii) CH4: The molar mass of one carbon atom is approximately 12.011 g/mol, and the molar mass of four hydrogen atoms is approximately 4(1.008 g/mol) = 4.032 g/mol. Therefore, the molar mass of one methane molecule (CH4) is:
12.011 g/mol + 4.032 g/mol = 16.043 g/mol
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