A sample of carbon dioxide gas (CO2) contains 8.551 x 1025 molecules. How many moles of carbon dioxide does this represent?

142.0 moles CO₂

Explanation:

To answer this question, we first need to know what a mole is. A mole represents of something, and in this case, that something is molecules.

So, to convert molecules into moles, we need to use the conversion factor  .

Doing so (using dimensional analysis) gives us:

b is the correct answer

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