kopatel228 M(Mg3N2) = 72 + 28 = 100
w(Mg) = 72/100 * 100% = 72%

ЯковПервый Mg3N2 - нитрид магния

Mr (Mg3N2) = 24 * 3 + 14 * 2 = 72 + 28 = 100

W (Mg) = (24 * 3) / Mr = 72 / 100 = 0.72 = 72%

Ответ: W (Mg) = 72%