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:

`(56)/(3.05) = (1)/(y)`

`56*y = 1*3.05`

`56y = 3.05`

`y = (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! =)