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H2CO3=2g+12g+16g*3=62g
KOH=39g+16g+1g=56g
mH2CO3=15g
n=m/M
n=15g/62g=o,24mola
2KOH + H2CO3-->K2CO3+2H20
2mole - 1mol
x - 0,24mola
x=2mole*0.24mola/1mol=0,48mola
Odp. Potrzeba ok 0,48moli KOH.