Question

CaO+H2O=Ca(OH)2+Co2=​

Answer 1

1. CaO + H2O = Ca ( OH ) 2

2. Ca ( OH ) 2 + CO2 = CaCO3 + H2O

Answer 2

You seem to have a little mix-up there. The correct chemical equation for the reaction between calcium oxide (CaO) and water (H2O) is:

$\text{CaO} + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2$

This reaction produces calcium hydroxide ($\text{Ca(OH)}_2$). The equation you provided with $\text{CO}_2$ suggests the production of carbon dioxide, but that's not the case in the reaction between CaO and H2O. If you have another reaction in mind, let me know!