Here's how to determine the mass ratio of Na to S in sodium sulfide (Na₂S):

1. Find the molar masses:

* Sodium (Na): 22.99 g/mol

* Sulfur (S): 32.06 g/mol

2. Calculate the mass of each element in one mole of Na₂S:

* Na: 2 moles Na * 22.99 g/mol Na = 45.98 g

* S: 1 mole S * 32.06 g/mol S = 32.06 g

3. Determine the mass ratio:

* Mass ratio of Na to S = 45.98 g Na / 32.06 g S

* Mass ratio of Na to S ≈ 1.43 : 1

Therefore, the mass ratio of Na to S in sodium sulfide is approximately 1.43 : 1.