A2,000g of c-14 is left to decay radioactively. the half-life of carbon-14 is approximately 5,700 years. what percentage of the sample will remain after 17,100 years?

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.

Air can be considered a mixture. which statement does not explain why?

The fact that the total amount of energy in a system remains constant is a(n)