What is original concentration of a solution that has a volume of 345 mL that is diluted to a concentration of 9.9 M of 255 mL?

Acovalent bond is formed between the two hydrogen bonds

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.

Idont know. if you want an answer you need to give us some context dude.

Ibelieve it is b. proton.hope my answer has you : )