If I have an unknown quantity of gas at a pressure of 2.2 atm, a volume of 31 liters, and a temperature of 287 K, how many moles of gas do I have?

How many atoms are there in 5.70 mol of mg

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

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.