Substâncias químicas no estado sólido no qual ocorre as forças de London entre as suas moléculas (gelo seco, por exemplo) tendem a sofrer sublimação (passagem do sólido direto para o estado gasoso). Justifique porque isso ocorre.

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.