6. The values of p, q, r and s in the balanced chemical equation: pBaCl2 + q A12 (SO4)3AlCl3 + s BaSO4 are respectively
(a) 3, 2, 2, 3 (b) 3, 1, 2, 3
(c) 2, 4, 2, 3 (d) 3, 1, 3,2

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