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ответ:
азотная кислота пассивирует алюминий.
cu + 4hno3(конц.) = cu(no3)2 + 2no2↑ + 2h2o
n(no2) = 4,48/22,4 = 0,2 моль
n(cu) = 0,1 моль
2al + 2naoh + 6h2o = 2na[al(oh)4] + 3h2?
n(no2) = 6,72/22,4 = 0,3 моль
n(al) = 0,3*2/3 = 0,2 моль
n(al): n(cu) = 2: 1
т.е. на 1 атом меди приходится 2 атома алюминия.
рассчитаем объем израсходовавшегося 40%-ого раствора гидроксида натрия:
n(naoh) = 0,2 моль
m(naoh) = 40*0,2 = 8 г
m(р-ра) = 8*100/40 = 20 г
v(р-ра) = 20/1,44 = 13,89 мл
p.s. проверим хватило ли воды в этом растворе:
n(h2o) = 0,6 моль
m(h2o) = 18*0,6 = 10,8 г
да, хватило.
е: