Question

Find the total number of neutrons present in 7mg of carbon-14​

Answer 1

Answer:

8

Explanation:

number of neutrons in C14= 8

C12 have 6 neutrons

Answer 2

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