Law! Rates Of Weathering Instruction Active
Calculating Percentage of Mass Remaining
Sample Sample Sample Sample
w Х Y z
Use the data to calculate the percentage remaining for
samples Y and Z to the nearest tenth of a percent
Initial Mass 80.00 g 90.00 g 85.00 g 95.00 g
The percentage remaining for Sample Y is
percent
Final Mass 75.00 g 87.30g 83.30 g 90.00 g
Percentage
93.8% 97.0%
Remaining
The percentage remaining for Sample Z is
percent

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.