How many Mg atoms are in 3.24 moles of Mg?

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Answer 1 · 2017-04-06T01:12:08

#1.95*10^24 " Mg atoms"#

We must use Avogadro's number: #6.022*10^23#

We set up the problem like this:

#3.24 " moles Mg"*# #(6.022*10^23 " Mg atoms")/(1 " moles Mg")#

#"moles Mg"# cancel

#3.24 cancel(" moles Mg")*# #(6.022*10^23 " Mg atoms")/(1 cancel(" moles Mg")#

Then we just compute

#3.24 *##(6.022*10^23 " Mg atoms")/1#

#=1.95*10^24 " Mg atoms"#