One of a substance contains the same number of molecules/atoms as in 12 grams of carbon 12

"mole"

Explanation:

That is the definition of mole. Mole is a unit for the measurement of how much there is of something. In other words, in SI, 1 mol of a substance contains the same number of molecules/atoms as in 12 grams of carbon 12.

(Approximately 6.28 × 10^23 --> Avogadro's constant)

For further explanation, check out Wikipedia's article here:

https://en.m.wikipedia.org/wiki/Mole_(unit)

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .