Description

combien trouve-t-on d’atomes dans 3 22 grammes de fer (fe) ?

To determine the number of atoms in 3.22 grams of iron (Fe), follow these steps:

1. **Find the molar mass of iron (Fe):** The molar mass of iron is 55.85 g/mol.

2. **Calculate the number of moles of iron:**
[
text{Moles} = frac{text{Mass}}{text{Molar Mass}} = frac{3.22 , text{g}}{55.85 , text{g/mol}} approx 0.0576 , text{mol}
]

3. **Multiply the number of moles by Avogadro’s number to find the number of atoms:**
[
text{Number of Atoms} = 0.0576 , text{mol} times 6.022 times 10^{23} , text{atoms/mol} approx 3.46 times 10^{22} , text{atoms}
]

**Final Answer:** There are approximately (3.46 times 10^{22}) atoms of iron in 3.22 grams of iron.