Final answer:
To find the number of moles of carbon dioxide, divide the given number of molecules by Avogadro's number. In this case, the sample represents 1.42 moles of carbon dioxide.
Step-by-step explanation:
To find the number of moles of carbon dioxide, we need to use Avogadro's number and the given number of molecules. Avogadro's number is 6.022 x 10^23, which represents the number of molecules in 1 mole of a substance. In this case, we have 8.551 x 10^25 molecules of CO2. To calculate the number of moles, we divide the given number of molecules by Avogadro's number:
Number of moles of CO2 = 8.551 x 10^25 molecules / (6.022 x 10^23 molecules/mol) = 1.42 mol
Therefore, the sample of carbon dioxide gas represents 1.42 moles of carbon dioxide.