Which element(s) is/are not balanced in this equation?

pb(no3) + 2 kci ⇒ pbci2 + kno3

a. n and o
b. pb, n, o
c. k, n, and o
d. k

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity