Chemistry

Question Analysis
This question involves a two-step calculation: determining the empirical formula from percent composition data, then confirming if it matches the molecular formula using the given molar mass. The main focus is on calculating the mass percentage of the missing element (O) and verifying the multiplier for formula scaling.

Key Concept Explanation
Empirical formula: Simplest whole-number ratio of atoms in a compound.
Molecular formula: Whole-number multiple ( ) of the empirical formula, where . If , the empirical and molecular formulas are identical.

Step-by-Step Solution
1. Calculate % of O:

2. Assume 100g sample and convert to moles (molar masses: Na=22.99 g/mol, S=32.06 g/mol, O=16.00 g/mol):
Moles of Na:
Moles of S:
Moles of O: