Calculate the percentage of nitrogen in the two important nitrogen fertilizers, ammonia (NH3) and urea (Co(NH2)2).

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 correct answer is weight.

Answer trigonal pyramidal;

Answer (b) supersaturation;