Question

the isotopic abundance of C-12 and C-14 is 98% and 2% respectively what would be the number of C-14 isotope in 12 g carbon sample

Answer 1

Answer:

14 g of carbon 14 atom contains =6.023×1023atoms

1 g of carbon 14 atom contains =6.023×1023/14

12 g of carbon 14 atom contains =(6.023×1023×12)/14

=5.16×1023

Now its 2% is (5.16×1023×2)/100

=10.32×1021

So, the number of C−14 atoms in 12 g of carbon is 10.32×1021

Explanation:

Answer 2

Answer:

1.032×10^22

Explanation:

1 mole of every substance contains 6.02×10^23 atoms.

so 14g of C-14 contains 6.02×10^23 atoms.

1g of C-14 contains 6.02×10^23/14 atoms.

12g of C-14 contains 6.02×10^23×12/14 which is 2%.

so 12g C-14 contains 6.02×10^23×12×2/14×100= 1.032×10^22 atoms