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! =)
