Aneutral atom of potassium (k) has an average mass of 39 amu and 19 electrons. how many neutrons does it have? a. 10 b. 19 c. 20 d. 58

20

Explanation:

In a neutral atom, the number of protons (p) equals the number of

electrons (e).

p = e

e = 19, so

p = 19

The mass number (A) is the number of protons plus the number of

neutrons (n).

 A = p + n

 A = 39, so

39 = 19 + n     Subtract 20 from each side.

  n = 20

The atom has 20 neutrons.

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2