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Calculati masa de oxid de potasiu ( K2O ) care contine 0,3 moli de ioni K+ .
Multumesc anticipat! :o3


Răspuns :

1mol K2O.........2moli de K+
xmoli K2O.......0,3moli de K+
x=0,3*1/2=0,15moli K2O
mK2O=n*MK2O=0,15*94=14,1g K2O