A10.00 g sample of a soluble barium salt is treated with
an excess of sodium sulfate to precipitate 11.21 g baso4
(m = 233.4). which barium salt is it?
(a) bacl2 (m = 208.2)
(b) ba(o2ch)2 (m = 227.3)
(c) ba(no3)2 (m = 261.3)
(d) babr2 (m = 297.1)

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