Verified answer

B. 4.00 g He

Because is exactly 1 mol of Helium

Good luck!

None

He is an inert gas and does not form Molecules as does Oxygen (O2) or Nitrogen (N2). The Moleclar wgt. is the same as the Atomic Wgt,. 2.

I assume that you are aware that the number 1023 is actually 10 to the 23rd power?

6.02 x 10^23 is avo's number, the amount of atoms in one mole. The molar mass of He is 4 g/mole...so the anwser is B, because 4grams of He equal one mole.

4.00 g He is one mole of Helium.

One mole contains 6.02 x 10^23 atoms.

The answer is B.

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