Find the mass in gram of 10 atom of He?

1 Answer
Nam D.
Jun 26, 2018

#6.64*10^-23 \ "g"#

Explanation:

An atom of helium has a mass of #4 \ "u"#. Know that #1 \ "u"=1.66*10^-24 \ "g"#.

So, #10# atoms of helium would have a mass of #10*4 \ "u"=40 \ "u"#. In grams, that is:

#40color(red)cancelcolor(black)"u"*(1.66*10^-24 \ "g")/(color(red)cancelcolor(black)"u")#

#~~6.64*10^-23 \ "g"#

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