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4. The molecular mass of sodium oxide [tex]$\left( Na_2O \right)$[/tex] is:

A. 61.97894
B. 22.98977
C. 45.97954
D. 38.98917

Sagot :

GinnyAnsweridn
To find the molecular mass of sodium oxide (Na₂O), we need to consider the atomic masses of sodium (Na) and oxygen (O), as well as the molecular structure of sodium oxide. Let's break it down step by step:

1. Find the atomic masses from the periodic table:
- The atomic mass of sodium (Na) is approximately 22.98977.
- The atomic mass of oxygen (O) is approximately 15.999.

2. Understand the composition of sodium oxide (Na₂O):
- Sodium oxide consists of two sodium (Na) atoms and one oxygen (O) atom.

3. Calculate the total molecular mass of sodium oxide:
- Since there are two sodium atoms in the compound, we multiply the atomic mass of sodium by 2:
[tex]\[ 2 \times 22.98977 \][/tex]
- Next, we add the atomic mass of one oxygen atom:
[tex]\[ 2 \times 22.98977 + 15.999 = 45.97954 + 15.999 \][/tex]
- This gives the total molecular mass:
[tex]\[ 61.97854 \][/tex]

Therefore, the molecular mass of sodium oxide (Na₂O) is 61.97854.

So, the correct answer is:
A. 61.97854
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