Estimate the normal boiling point of decane using Trouton's rule (estimating that AS is approximately 87-88 J/(K. mol)] assuming that the enthalpy of vaporization, Hvap = 39.58 kJ/mol , remains relatively constant. Express your answer in kelvins to three significant figures.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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.

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.