Question

What is the mass percent composition of carbon in Na₂CO₃.

Answer 1

Atomic masses: Na = 23, C = 12, O = 16

(2 × 23) + 12 + (3 × 16)

= 46 + 12 + 48

= 106 g/mol

Mass Percent Formula = `"Mass of Carbon"/"Total Molecular Mass" xx 100`

= `12/106 xx 100`

= 11.32%