Question

How many atoms are in 11.9 moles of chromium?

Answer 1

Use the following equation:
Given # of moles *  molar mass (g) per mol = Mass (g)
This gives us 11.9 x  51.9962 (g) per mol.

618.75 moles

Answer 2

Answer:

$7,16.10^{24}$

Explanation:

We know that in 1 mole of any substances there are $6,02. 10^{23}$ atoms

This number ($6,02. 10^{23}$) 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

$1 mol Cr\longrightarrow 6,02.10^{23} atoms\\ 11.9 moles Cr\longrightarrow x\\x=\frac{(11.9)(6,02.10^{23})}{1}\\ x= 7,16.10^{24} atoms$

In 11.9 moles of chrome there are $7,16.10^{24}$ atoms