Zadanie 1
a) N:O=2:3
b) mN:mO=28:48=7:12
c) 28u---x%
76u---100%
x=36,84%N
100%-36,84%=63,16%O
Zadanie 2
4Al+3O2--->2Al2O3
27g xg 51g
27g+x=51g
x=24 g
Zadanie 3
12u 288u
C+2Cu2O--->4Cu+CO2
xg 72g
12u---288u
xg---72g
x=3 g
