How many helium atoms are in a 12.0 g sample?

The number of helium atoms present are

Explanation:

To calculate the number of moles, we use the equation:

Given mass of helium = 12.0 g

Molar mass of helium = 4 g/mol

Putting values in above equation, we get:

According to mole concept:

1 mole of an element contains  number of atoms.

So, 3 moles of helium will contain = number of atoms.

Hence, the number of helium atoms present are

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