Question

Calculate the mass of 6.20 x 10^22 tungsten atoms?

Answer 1

first step is to calcuate the how many mols are 6.20x10^22 atoms:

Let´s remember that 6.022x10^23 atoms are 1 mol, so:

$\frac{6.20\times10^{22}atoms}{6.022\times10^{23\text{ }\frac{atoms}{mol}}^{}}=\text{ 0.1}029\text{ mol}$

Now all you need to do is to multiply the number of mols by the atomic mas of tungsten, which is 183.84 g/mol:

$0.1029\text{mol}\times183.84\frac{g}{mol}=\text{ }18.93g$