Answer:
[tex]7,16.10^{24}[/tex]
Explanation:
We know that in 1 mole of any substances there are [tex]6,02. 10^{23}[/tex] atoms
This number ([tex]6,02. 10^{23}[/tex]) is a constant that is known as the avogadros number
if we know how many atoms are in a mole of chromium to calculate how many there are in 11.9 moles we apply a simple rule of three
[tex]1 mol Cr\longrightarrow 6,02.10^{23} atoms\\ 11.9 moles Cr\longrightarrow x\\x=\frac{(11.9)(6,02.10^{23})}{1}\\ x= 7,16.10^{24} atoms[/tex]
In 11.9 moles of chrome there are [tex]7,16.10^{24}[/tex] atoms
