three nails have a mass of 3.05 g. how many moles of iron do the 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

Portanto:
[tex] \frac{56}{3.05} = \frac{1}{y} [/tex]

[tex]56*y = 1*3.05[/tex]
[tex]56y = 3.05[/tex]
[tex]y = \frac{3.05}{56} [/tex]
[tex]\boxed{y = 0.05446... mol}}[/tex]

Soon:
3 nails → 3*0.05446... = 0.1638...mols

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kobenhavn kobenhavn · Answer 2 · 2019-01-19T10:32:36+01:00

kobenhavn kobenhavn

19-01-2019

Answer: 0.05 moles

Explanation: According to Avogadro's law, 1 mole of every substance contains Avogadro's number of particles and weighs equal to the molar mass of the substance.

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Given mass = 3.05 g

Molar mass of iron = 56 g/mol

[tex]Moles=\frac{3.05g}{56g/mol}=0.05moles[/tex]

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