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C=12u, O=16u, Al=13u
Al2(co3)3=2*27+3(12+48)=234u
b)azotanu (V) potasu - KNO3
K = 39u, N = 14u, O3 - 3*16u = 48u
KNO3 = 39+14+48 = 101u
mAl2(CO3)3=2*27u+3*12u+9*16u=234u
b)azotanu (V) potasu---KNO3
mKNO3=39u+14u+3*16u=101u