Aflask contains 4.4grams of carbon dioxide gas calculate how many molecules of co2 as are present in the same?

6.0x10^22 molecules  
First, let's calculate the molar mass of CO2, start by looking up the atomic weights of carbon and oxygen. Atomic weight carbon = 12.0107 Atomic weight oxygen = 15.999  
Molar mass CO2 = 12.0107 + 2*15.999 = 44.0087 g/mol  
Now, calculate the number of moles of CO2 you have: 4.4 g / 44.0087 g/mol = 0.099980231 mol  
Finally, multiply by Avogadro's number to get the number of molecules of CO2. 
0.099980231 * 6.0221409x10^23 = 6.0209504x10^22  
Now round to 2 significant figures since that's how accurate our input data was, giving: 6.0x10^22 molecules.