Need urgent help!! A mass of 6.01 g S-33 (with an atomic mass of 32.97 amu) contains

a
198 mol S-33
b
0.182 mol S-33
c
cannot be calculated because S- 33 is an isotope of sulfur.
d
0.376 mol S-33

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.