M(C3H8) = 44; C = 12 * 3 / 44 * 100% = 82% ; H = 1 * 8 / 44 * 100% = 18%
M(Cu2S) = 160; Cu = 64 * 2 /160 * 100% = 80% ; S = 32 * 1 / 160 * 100% = 20%
M(NH3) = 17; N = 14 * 1 /17 * 100% = 82% ; H = 1 * 3 / 17 * 100% = 18%
M(MgO) = 40; Mg = 24 * 1 /40 * 100% = 60% ; O = 16 * 1 / 40 * 100% = 40%
В некоторых случаях массовая доля примерна
<span>4,5 - диметилгексин - 1
</span>
1)CaCO3=CaO+CO2
2)3CaO+2AlC3>3CaC2+Al2O3
3)CaC2+2HCl>CaCl2+C2H2
4)2C2H2+5O2>4CO2+2H2O
5)CO2+C>2CO
Al2O3 +6 HCl = 2AlCl3 + 3H2O
Al2O3 + 6H(+) + 6Cl(-) = 2Al(+3) + 5Cl(-) + 3H2O
Al2O3 + 6H(+) = 2Al(+3) + 3H2O