How many grams do 3.3 x 10^2 atoms of calcium weigh?

1 Answer
anor277
Oct 1, 2016

Not a great deal.

Explanation:

#6.022xx10^23# #"calcium atoms"# have a mass of #40.08*g#. The given large number is the #"Avogadro constant"#, of which you will have heard.

So, to work out the mass of 330 calcium atoms we calculate the quotient:

#(3.3xx10^2" calcium atoms")/(6.022xx10^23" calcium atoms mol"^-1)xx40.08*g*mol^-1#

#=# #??g#.

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