A silicon wafer with dimensions 15.00 cm x 15.00 cm x 0.0400 cm contains 0.746 moles of silicon. How many grams of Si does this
represent?

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.

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The time that is taken by neptune once around the sun is called