Converting Moles of Iron to kg: Net Charge Calculation

[pat666]

Homework Statement

A piece of solid Iron contains 2.5moles of atoms. Whats its mass? suppose one atom in 10^12 were missing one electron, what would be the net charge of the iron?

Homework Equations

The Attempt at a Solution

atomic mass 192.22u
so mass should be 2.5*192.22 = 480.55g but the answer is 139.6g. I suck at chem and don't have a clue where I went wrong?

Thanks

 

[ehild]

You used a wrong value for the amtomic mass of iron.

http://www.chemicalelements.com/elements/fe.html

ehild

 

[pat666]

So I did, what the element Ir then?

 

[ehild]

Why Ir? Read the text, it is about Iron.

ehild

 

[pat666]

Yeah I was thinking that Ir was Iron that's where I got the bad value from.

 

[ehild]

Ir is Iridium, Iron is Fe (Ferrum).

ehild