Question

one million atoms of a particular element have a mass of 1.99 ×10^-17 grams. how many moles of this element are there?

Answer 1

(1.99x10^-17) x 1000000
= 1.99x10^-11 (1.99x10^-11) / (6.023x10^23)
 = 3.304001328x10^-35
hope this helps