B. Caffeine has an empirical formula of C4H5N20 and a molar mass of 194 g/mol. What is its molecular formula? (3 points)

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.

The heat added represents an energy change.