CaCO3=CaO+CO2
2NaOH+CO2=Na2CO3+H2O
MCaCO3=ACa+AC+3AO=40+12+3*16=100g/mol
MCO2=AC+2AO=12+2*16=44g/mol
MNaOH=ANa+AO+AH=23+16+1=40g/mol
100g CaCO3.................44gCO2
1000GCaCO3...................XgCO2
X=1000*44/100=440gCO2
2*40gNaOH........................44gCO2
y gNaOH.............................440g CO2
Y=2*40*440/44=800g NaOH
c=md/ms*100
ms=md*100/c=800*100/40=2000 g NaOH=2kg NaOH