Current is passed through the following balanced electrolytic cell 5Co2+ + MnO4– + 8H+ → 5Co3+ + Mn2+ + 4H2O. All the MnO4– ions present in 25.0 mL of solution have been reduced after a current of 0.600 ampere has passed for 844 seconds. What was the original concentration of MnO4– ions?

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.