Ammonia will decompose into nitrogen and hydrogen at high temperature. an industrial chemist studying this reaction fills a tank with of ammonia gas at . she then raises the temperature, and when the mixture has come to equilibrium measures the amount of hydrogen gas to be . calculate the concentration equilibrium constant for the decomposition of ammonia at the final temperature of the mixture. round your answer to significant digits.

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.