Hey there!
One mole has 6.022 x 10²³ molecules.
We have 15.7 moles, so multiply.
15.7 x 6.022 x 10²³ = 9.45 x 10²⁴
There are 9.45 x 10²⁴ molecules in 15.7 moles of carbon dioxide.
Hope this helps!
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