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Chemistry, 22.06.2019 14:00
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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Chemistry, 23.06.2019 01:30
If a particle has z = 25 and 23 electrons, what is its charge?
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Chemistry, 23.06.2019 06:30
The molar mass of cu is 63.55 g/mol. the number of grams of cu produced in this reaction is
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