Решить цепочку превращений S→H2S→SO2→Na2SO3→SO2

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Нам дано уравнение: 2CH3NH2+4O2=2CO2+4H2O+N2(газ);                                      находим ню(СH3NH2)=V/Vm=>20/22.4=0.89 моль                                                    обозначим ню азота за х.Тогда получаем пропорцию:0.89/2=x/1 и тогда х=0.89/2=0.445 моль. Ну и находим объем азота по формуле:V=ню*Vm=>V(N2)=0.445*22.4=9.968=10 л.                                                  ответ:10 л.                                                                                                              Если что-то не понятно,пиши объясню:)