44g of CO2 always contains avogadro number of molecules?

Yes, 44 g of CO₂ would always contain 6.02 × 10²³ molecules.

Changing conditions (temperature and/or pressure) could change the physical state of CO₂ or volume of CO₂ gas, but NOT the mass and number of molecules.

Avogadro's law

yes that is correct

No, 12g of Carbon contains 6.02*10^23 molecules as this is where the number came from. Therefore, 44g of CO2 must contain more than this amount of molecules.