1. Calculate the specific heat of a piece of wood if 1500.0 g of the wood absorbs 67,500 joules of heat, and its temperature changes from 32.0 oC to 57.0 oC.
2. What will be the final temperature of a 50.0 g piece of glass if it absorbs 5275 joules of heat and its specific heat capacity is 0.50 J/g oC? The initial temperature of the glass is 20.0 oC.

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.