In old-time photography flash bulbs were made by burning magnesium metal to produce a very bright light. How many molecules of O2 is needed to completely burn 12.0 g of magnesium.

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.

Go ask spider man