Question

Three nails have a mass of 3.05 g. How many moles of iron do they contain?

Answer 1

Hello!

Three nails have a mass of 3.05 g. How many moles of iron do they contain?

Data:

3 nails of iron = 3.05 g (by nail)  

The atomic mass of iron is 55.845 amu, so the molar mass is:

M = 55.845 → M ≈ 56 g / mol    

With a simple 3 rule:  

56 g → 1 mol

3.05 g → y mol  

Therefore:

$\dfrac{56}{3.05} = \frac{1}{y}$

$56*y = 1*3.05$

$56y = 3.05$

$y = \dfrac{3.05}{56}$

$\boxed{y \approx 0.05446\:mol}}$

Soon:

3 nails → 3*0.05446 = 0.1638 moles (answer)

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I Hope this helps, greetings ... Dexteright02! =)