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mNO₂=14u+2x16u=46u
mN=14u
mO₂=2x16u=32u
%N=14u/46u x 100%~=30,43%
%O=32u/46u x 100%=69,57%
Zadanie 2
K/Br=39/80
Ca/Cl=40u/2x35u=40/70=4/7
Al/O=2x27u/3x16u=54/48=9/8