Question

the molecular mass of sodium oxide (na₂o) is
a) 61.97894.

b) 45.97954.

c) 38.98917.

d) 22.98977.

Explanation:

Step1: Recall atomic masses

Atomic mass of Na (sodium) is approximately 22.98977 g/mol, and atomic mass of O (oxygen) is approximately 15.9994 g/mol.

Step2: Calculate molecular mass of \( \text{Na}_2\text{O} \)

Molecular mass = (2 × atomic mass of Na) + (1 × atomic mass of O)
= \( 2\times22.98977 + 15.9994 \)
= \( 45.97954 + 15.9994 \)
= \( 61.97894 \)

Answer:

A) 61.97894