Question

What is the mass of 0.2 mole of oxygen atom??​

Answer 1

✨ANSWER ✨

Mass of 1 mole Oxygen atoms = 16 grams

Mass of 0.2 mole oxygen atoms = 16 × 0.2

= 3.2 grams

✌THANKS ✌

Answer 2

We know that:

16 u = Mass of 1 mole of $\sf{O_{2}}$ atom.

That is:

It weighs 16 g.

Therefore:

Mass of 0.2 mole of $\sf{O_{2}}$ atoms:

$\implies$ $\sf{16 \times 0.2}$

$\implies$ $\sf{3.2 \: u}$

Note:

Here 'u' refers to unified atomic mass unit.