Find the number of neutrons in 7mg of C-14

Asked by RIZWAN YASIN | 24th May, 2013, 11:42: PM

Expert Answer:

At wt of C-14 = 14g/mole and in 1 mole C-14 there are 6.022 x 1023 atoms.
 
7 mg = 0.007 g
So, No of moles of C-14 = 0.007g / 14 g/mole  = 0.0005 moles
 
So No of C-14 atoms in 0.0005 moles =  0.0005 x 6.022 x 1023 atoms 
= 3.00 x 1020
 
In 1 C-14 there are 8 neutrons, so total neutrons = 8 x 3.00 x 1020 = 2.4 x 1021

Answered by  | 25th May, 2013, 10:35: AM

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