[dipndots]

So heres the question:

It is found that 0.119g of element Z contains 1.50 x 10^21 atoms. The atomic mass of Z is..

[Yggdrasil]

Please read the Forum Rules.  You should that you've at least attempted to answer the problem before we will help you.

[Padfoot]

What is atomic mass?

[dieded]

Remember the Avogadro constant .

Approximately 6 * 10^23 atoms of Z will make up the atomic mass of Z.

And Yggdrasil you should at least at least help out dipndots a bit.

[Borek]

Mass of 5 marbles is found to be 3 g, what is a mass of a dozen?

[kiet]

  1 mol atoms has 6.023 x 10^23 atoms
We know that  n =(the amount of atoms)/(6.023x10^23)
               => n = (1.50x10^21)/(6.023X10^23) =0.00249 (mol)
   and m=nxM => M=m/n=0.119/0.00249=47.79
So the atomic mass of the element Z is approximately 47.8
Z is Titanium.

[dipndots]

I got it. omg thanks. Seems simple when u explained it