Container A has a volume of 1.23cm^3 and contains a gas under 4.56atm of pressure. Container B has a volume of 0.93cm^3 and contains a gas under 3.23atm of pressure. Container C has a volume of 1.42cm^3 and contains a gas under 2.24atm of pressure. If all of these gases are put into container D (volume of 1.51cm^3), what is the pressure in container D?

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.