The correct answer is 2.99 helium atoms.
I hoped this helped!
Answer:
By weight they have the same mass, but the number of atoms is different
Explanation:
Mass is not conserved in chemical reactions. Mass is therefore never conserved because a little of it turns into energy in every reaction
1 mole = 70.9
X mole = 140
X=1.9746 moles
X= 1.98 when rounded to 3 significant figures.
Gas and radio waves I’m pretty sure is correct
