1) What dishes & substances are needed to find the molecular formula of CoCl2 · nH2O crystal hydrate? If possible, outline what the process might look like; 2) It is known that 32.5 g of anhydrous CoCl2 was obtained by heating 50 g of CoCl2 · nH2O crystal hydrate. What will be the molecular formula of the crystal hydrate?

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.

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these