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JcAlmighty
The answer is 6.023 × 10²³ molecules

Avogadro's number  is the number of units (atoms, molecules) in 1 mole of substance:

6.023 × 10²³ molecules per 1 mole

Let's calculate how many grams are in 1 mole. This is expressed as molar mass Mr:
Mr(CO2) = Ar(C) + 2Ar(O)
Ar(C) = 12
Ar(O) = 16
Mr(CO2) = 12 + 2 * 16 = 12 + 32 = 44 g

There are 44 g in 1 mole.
There are 6.023 × 10²³ molecules in 1 mole.

So there are 44 g in 6.023 × 10²³ molecules

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