Question

a sample of cl contain 80% cl^35 and 20% cl^37 isotopes. The average number of neutrons per atom is

Answer 1

ANSWER:

35.4

EXPLANATION:

35*80/100+37*20/100

Hope it helps.....

Answer 2

Answer:

The average number of neutrons in each atom is 18.4.

Explanation:

We know that in a Chlorine atom the number of protons = 17

To find the number of neutrons in the isotopes of chlorine, we subtract 17 from each atomic mass.

The number of neutron in $Cl^{35}$ = 35 - 17 = 18

The number of neutron in $Cl^{37}$ = 37 - 17 = 20

The percentage of $Cl^{35}$ = 80% (0.8)

The percentage of $Cl^{37}$ = 20% (0.2)

The average number of neutrons will be:

$Average = (18 * 0.8) + (20 * 0.2)\\= 14.4 * 4 \\= 18.4$

Conclusion:

18.4 is the average number of neutrons per atom.