Question

Question #e0977

Answer 1

`3.9 * 10^24` atoms Fe

Explanation:

`6.5 mol (Fe) * 6.022*10^23` atoms/mol `= 3.9 * 10^24` atoms

It's important to mention that 6.5 moles of anything is going to be `3.9*10^24` It could be carbon atoms, helium, etc... If I had 6.5 moles of tennis balls I would have `3.9*10^24` tennis balls, though that volume would likely fill all of Europe.

Answer 2

See below...

Explanation:

In 1 Mole there are always `6.02 * 10^23` atoms.

`therefore` in `6.5` moles:

`6.5 * 6.02 * 10^23 = 39.13 * 10^23`

For scientific notation, the number has to be between `1` and `10`. Therefore we must pull the decimal point back, hence adding another power of `10` on.

Final answer `= 3.913 * 10^24` atoms