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Use the table of molar masses to complete the question. Do NOT use any other values except the ones provided in the table below.

Element Molar Mass (g/mol)
carbon 12.01
hydrogen 1.01
oxygen 16.00
Using only the molar mass values provided in the table above, correctly calculate the molar mass of Ethanol (CH3CH2OH
) and type in the value below. (Your answer should be a number with 2 decimal places; i.e. the hundredths place).

(2 points)
The molar mass of Ethanol is:
grams

1 answer

To calculate the molar mass of Ethanol (CH3CH2OH), we need to sum the molar masses of all the atoms in the molecular formula.

Ethanol has the following composition:

  • 2 carbon (C) atoms
  • 6 hydrogen (H) atoms
  • 1 oxygen (O) atom

Using the molar masses provided in the table:

  • Molar mass of carbon (C) = 12.01 g/mol
  • Molar mass of hydrogen (H) = 1.01 g/mol
  • Molar mass of oxygen (O) = 16.00 g/mol

Now, we can calculate the total molar mass of Ethanol:

\[ \text{Molar mass of ethanol} = (2 \times \text{molar mass of C}) + (6 \times \text{molar mass of H}) + (1 \times \text{molar mass of O}) \]

Substituting in the values:

\[ = (2 \times 12.01 , \text{g/mol}) + (6 \times 1.01 , \text{g/mol}) + (1 \times 16.00 , \text{g/mol}) \]

Calculating each term:

  1. \( 2 \times 12.01 = 24.02 , \text{g/mol} \)
  2. \( 6 \times 1.01 = 6.06 , \text{g/mol} \)
  3. \( 1 \times 16.00 = 16.00 , \text{g/mol} \)

Now adding these results together:

\[ 24.02 + 6.06 + 16.00 = 46.08 , \text{g/mol} \]

Therefore, the molar mass of Ethanol is:

46.08 grams