Mass fraction of carbon in ammonium carbonate is …

Given:
(NH4) 2CO3

Find:
ω (C in (NH4) 2CO3) -?

Solution:
1) Using the periodic system of D.I.Mendeleev, calculate the relative molecular weight of ammonium carbonate:
Mr ((NH4) 2CO3) = Ar (N) * 2 + Ar (H) * 4 * 2 + Ar (C) + Ar (O) * 3 = 14 * 2 + 1 * 4 * 2 + 12 + 16 * 3 = 96;
2) Calculate the mass fraction of carbon in ammonium carbonate:
ω (C in (NH4) 2CO3) = N (C in (NH4) 2CO3) * Ar (C) * 100% / Mr ((NH4) 2CO3) = 1 * 12 * 100% / 96 = 12.5%.

Answer: Mass fraction of carbon in ammonium carbonate is 12.5%