If you have #2.4 xx 10^24# atoms of copper, how many moles of copper do you have?

1 Answer
Jun 20, 2018

Answer:

Well what is the #"Avocado number"#?

Explanation:

This is given as supplementary material in every chemistry and fyzics exam you sit...

#N_"Avocado"=6.022140857(74)xx10^23*mol^-1#...and please note the units...

And so we take the quotient...

#(2.4xx10^24*"copper atoms")/(6.022140857(74)xx10^23*mol^-1)#

#=3.99*mol*"copper atoms"#...a mass of approx. #250*g#...how did I know that?