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Question 6
Plant cells have a strong, rigid outer layer known as the cell wall. The function of the cell wall is to -
help the cell maintain its shape under changing water pressure.
convert energy from sunlight into chemical energy.
regulate the transfer of material into the cell.
separate genetic material from the rest of the cell.
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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.