A sample of pure copper has a volume of 3.75 cm3. Calculate its mass

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

Matches the chemical name of each oxide of phosphorus to its chemical formula

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.