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Which of the following substances has the highest molar mass?
- A Oxygen (O2)
- B Methane (CH4)
- C Water (H2O)
- D Ethanol (C2H5OH)
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Among the given options, ethanol (C2H5OH) has the highest molar mass. The molar mass of ethanol is approximately 46.07 g/mol, whereas oxygen (O2) has a molar mass of approximately 32 g/mol, methane (CH4) has a molar mass of approximately 16 g/mol, and water (H2O) has a molar mass of approximately 18.02 g/mol.