A chemist needs to store 19.4 g of oxygen gas in a 5.12 L cylinder. The cylinder can withstand a pressure of 1820 mmHg before it explodes. Calculate the maximum temperature (in Celsius) at which this oxygen can be stored.

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.