Answer:
[tex]2.19x10^{-19}gCs[/tex]
Explanation:
Hello there!
In this case, it is possible to know that the amount of atoms of cesium are related to moles by means of the Avogadro's number, for that reason we first compute the moles in 992 atoms of this element:
[tex]992atomsCs*\frac{1molCs}{6.022x10^{23}atomsCs}=1.65x10^{-21}molCs[/tex]
Next, given its molar mass, we can compute the mass:
[tex]1.65x10^{-21}molCs*\frac{132.91gCs}{1molCs}\\\\2.19x10^{-19}gCs[/tex]
Best regards!
