Question

A sample contains 1.5 × 10 20 atoms of carbon . find moles of carbon​

Answer 1

If we use unitary method:

I mole of carbon =6.022x10^23 carbon atoms

X moles of carbon =1.5x10^20 carbon atoms

Therefore

X = 1.5x10^20/6.022x10^23

Calculate and you have your answer