Question

How many atoms does 2.0 moles of Helium (He) represent?
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Answer 1

12.044×10^23

Step-by-step explanation:

Molecular mass is the sum of atomic masses of the elements present in a molecule. 12 gram of carbon that is one mole contains

6.022×10^23 atoms

. It is called Avogadro's constant.

So, Number of particles = Given number of moles

×

Avogadro number.

Therefore, the number of atoms of He in 2.0 moles = 2.0× 6.022×10^23= 12.044×10^23

There are

12.044×10^23

atoms in 2.0 moles of Helium.