2. According to the theory of continental drift, why do the coastlines of Africa and South America appear to fit together so well? O A Africa and South America used to be joined together, but split apart long ago.
O B. Africa and South America are drifting towards each other and will soon fit together perfectly
O c Ocean currents on either side of the Atlantic have eroded the coastlines into the same shape.
O D. The theory does not explain why the coastlines seem to match,

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2