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2*39 = 78 u - potas
C =12 u - węgiel
O= 16*3= 48 u - tlen
78u + 12u + 48u = 138 u
Na2O - tlenek sodu
Na = 23 u*2 = 46 u
O = 16 u
46u + 16u = 62u
OH2 - wodór tlenku
O = 16u
H = 2*1=2u
16u+2u=18u
HCl - kwas solny
H = 1u
Cl =35u
35u + 1u = 36u.
mK₂CO₃= 39u x 2 + 12u + 16u x 3 = 78u + 12u + 48u = 138u
Tlenek Sodu
mNa₂O= 23u x 2 + 16u = 46u + 16u = 62u
Wodór tlenek
mH₂O= 1u x 2 + 16u = 2u + 16u = 18u
Kwas solny
mHCl= 1u + 35u = 36u