Zadanie 1
mS:mO=2:3
2---x%
5---100%
x=40%S
100%-40%=60%O
Zadanie 2
2 mol 1 mol
2Cu+S--->Cu2S
xmol 7 mol
2 mol---1 mol
xmol---7mol
x=14 mol
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Zadanie 1
mS:mO=2:3
2---x%
5---100%
x=40%S
100%-40%=60%O
Zadanie 2
2 mol 1 mol
2Cu+S--->Cu2S
xmol 7 mol
2 mol---1 mol
xmol---7mol
x=14 mol