Q.which of the following weigh most? (1)50g of iron (2)5g atoms of nitrogen (3)0.1g atom of silver (4)1×10^23 atoms of carbon Explain this with brief solution?

1 Answer
Apr 18, 2018

Surely it is #(1)#, the #50* g# mass of iron?

Explanation:

Between #(1)#, and #(2)#, and #(3)#, CLEARY the #"order of increasing mass"# is #underbrace(3<2<1)_rarr#.

#(4)# proposed #1xx10^23# #"carbon atoms"#. And now I know (how), that #6.022xx10^23# individual carbon atoms have a mass of #12.0*g#. And so the mass associated with #(4)# is...

#(12.0*g*mol^-1)/(6.022xx10^23) xx1xx10^23*mol^-1~=2*g#.

And so we rewrite the order....

#underbrace(3<4<2<1)_rarr# #"order of increasing mass"#

Does you agree?