Which of the following is the best example of chemical energy being converted into thermal energy? a. hydrogen turning into helium inside the Sun, giving off heat energy

b. burning a candle in a room

c. splitting uranium in a nuclear weapon, giving off heat

d. heating a molecule up so it can create a new substance

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.