4.515 x 10^24 atoms of purellium distinkamide is equal to ___ moles?

7.5
6.2
19.2

Using dimensional analysis, we have

4.515x1024 atoms x 1 mole/6.022x1023 atoms = 7.4975 moles = 7.498 moles of PD

So the official answer is 7.5

Explanation:

"Purellium Distinkamide" is a silly joke name for a made-up compound. The idea of this question is that no matter what the substance we are talking about is - water (H2O), hydrogen gas (H2), or even "Purellium Distinkamide" - a mole is always the same number of molecules, 6.022 x 1023. This is Avogadro's number and you have probably seen it around class a lot!

the answer to your question is c.

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