Express the equilibrium constant for the following equation 2Na+2H2O-> <-2NaOH + H2

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.

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false