Легкая
M(H2SO4) = 1*2 + 32 + 16*4 = 98
w(H) = (Ar(H) * 2)/M(H2SO4) = 2/98 = 0,0204 или 2,04%
w(S) = Ar(S)/M(H2SO4) = 32/98 = 0,3265 или 32,65%
w(O) = (Ar(O)*4)/M(H2SO4) = (16*4)/98 = 0,6531 или 65,31%
Проверка: 2,04 + 32,65 + 65,31 = 100%
2Al+3H2SO4=Al2(SO4)3+3H2
2 3
n(H2)=17,9:22,4=0,8моль;n(Al)=05моль;m(Al)=0,5*27=14,4г;W(Al)=14,4г:16,3г=0,88(88%)
Реакции ионного обмена