To find the molecular mass of sodium oxide, [tex]\( \text{Na}_2\text{O} \)[/tex], we need to sum the atomic masses of all atoms in the molecule. Sodium oxide consists of two sodium ([tex]\( \text{Na} \)[/tex]) atoms and one oxygen ([tex]\( \text{O} \)[/tex]) atom.
1. Atomic Mass of Sodium ([tex]\( \text{Na} \)[/tex]):
The atomic mass of one sodium atom is 22.989769.
2. Atomic Mass of Oxygen ([tex]\( \text{O} \)[/tex]):
The atomic mass of one oxygen atom is 15.999.
3. Calculate the Total Mass:
The molecular mass of [tex]\( \text{Na}_2\text{O} \)[/tex] can be calculated as follows:
[tex]\[
\text{Molecular mass of } \text{Na}_2\text{O} = (2 \times \text{Atomic mass of } \text{Na}) + (\text{Atomic mass of } \text{O})
\][/tex]
[tex]\[
\text{Molecular mass of } \text{Na}_2\text{O} = (2 \times 22.989769) + 15.999
\][/tex]
[tex]\[
\text{Molecular mass of } \text{Na}_2\text{O} = 45.979538 + 15.999
\][/tex]
[tex]\[
\text{Molecular mass of } \text{Na}_2\text{O} = 61.978538
\][/tex]
So, the molecular mass of sodium oxide ([tex]\( \text{Na}_2 \text{O} \)[/tex]) is 61.978538.
Given the options:
A. 45.97954
B. 38.98917
C. 61.97894
D. 22.98977
The correct answer is:
C. 61.97894
Please note, while the exact number calculated is 61.978538, option C (61.97894) is the closest and most reasonable match provided in this context.
