Question

The molecular mass of sodium oxide (Na2O) is
Question 14 options:

A)

38.98917.

B)

45.97954.

C)

61.97894.

D)

22.98977.

Answer 1

To calculate the molecular mass of sodium oxide (Na₂O), we need to sum the atomic masses of sodium (Na) and oxygen (O).

1. The atomic mass of sodium (Na) is approximately 22.99 g/mol.
2. The atomic mass of oxygen (O) is approximately 16.00 g/mol.

Now, Na₂O consists of 2 sodium atoms and 1 oxygen atom:

- Mass from sodium: \( 2 \times 22.99 \, \text{g/mol} = 45.98 \, \text{g/mol} \)
- Mass from oxygen: \( 1 \times 16.00 \, \text{g/mol} = 16.00 \, \text{g/mol} \)

Now, add these together:

\[
\text{Molecular mass of Na}_2\text{O} = 45.98 \, \text{g/mol} + 16.00 \, \text{g/mol} = 61.98 \, \text{g/mol}
\]

Therefore, the molecular mass of sodium oxide (Na₂O) is approximately 61.98 g/mol. The closest answer from the options provided is:

**C) 61.97894.**