Its Na20
the formula for sodium oxide
Zwitterion is an ion consists of equal positive and negative charges on the same molecule which make it more stable and has high melting point
p-aminobenzene sulfonic acid contains both acidic (-SO₃H) and basic groups (NH₂), the acidic group will lose one proton to give (-SO₃⁻) and the basic group will gain this proton to give (-NH₃⁺)
The structure is:
Mass percent= grams solute/ grams of solution x 100
Mass Percent= (50/ 150)x100= 33.3%