ДЗ по химии 8 класс

Mr (NH4NO3) = 2*Ar (N) + 4*Ar (H) + 3*Ar (O) = 2*14 + 4*1 + 3*16 = 80

w (N) = (2 * Ar (N) / Mr (NH4NO3)) * 100% = (2 * 14 / 80) * 100% = 35%

w (H) = (4 * Ar (H) / Mr (NH4NO3)) * 100% = (4 * 1 / 80) * 100% = 5%

w (O) = (3 * Ar (O) / Mr (NH4NO3)) * 100% = (3 * 16 / 80) * 100% = 60%

Ответ: w (N) = 35%, w (H) = 5%, w (O) = 60%