If 2.0g of Zn and 2.0g of copper (II) chloride are reacted, zinc chloride and copper are produced. Calculate the amount of copper produced

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.

What is happening when the water inside a kettle heats up and begins to boil

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.