Find the molar mass of ethanol, C2H6O.

Question

BlackTom AI · Accepted Answer

Molar mass is the sum of the atomic masses of all atoms in a molecular formula, expressed in g/mol.

1) Relevant knowledge points and concepts
- Atomic (relative) masses of elements are taken from the periodic table (commonly used values: C = 12.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol).
- For a compound, multiply each element’s atomic mass by its subscript in the formula and add the results.
- Final result is reported with appropriate significant figures or rounding.

2) Step-by-step reasoning
- Ethanol has formula C2H6O, so it contains 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom.
- Use the common atomic masses listed above and multiply by the counts.

3) Calculations with intermediate steps
- Carbon: 2 × 12.01 g/mol = 24.02 g/mol
- Hydrogen: 6 × 1.01 g/mol = 6.06 g/mol
- Oxygen: 1 × 16.00 g/mol = 16.00 g/mol
- Sum: 24.02 + 6.06 + 16.00 = 46.08 g/mol

4) Why this answer is correct
- The molar mass is exactly the arithmetic sum of the contributions from each atom type. Using standard atomic mass values above yields 46.08 g/mol. Slightly different atomic mass tables or more digits (e.g., H = 1.008) can give results like 46.07 g/mol, but 46.08 g/mol is the conventional value when using C = 12.01 and H = 1.01.

5) Why other options are incorrect
- No alternative answer choices were provided in the prompt. Any other numerical value would disagree with the sum shown above or arise from different rounding/atomic-mass conventions; the calculation above demonstrates the correct total for the chosen standard atomic masses.

6) Conclusion
- The calculated molar mass of ethanol C2H6O is 46.08 g/mol, which matches the provided correct answer.

Find the molar mass of ethanol, C2H6O.单项选择题

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