Question #e0977

2 Answers
Feb 11, 2018

Answer:

#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.

Feb 11, 2018

Answer:

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