En la molécula de agua (H2O) siempre existe una relación en masa de un 11,2 % de hidrógeno y un 88,8 % de oxígeno. ¿A qué ley hace referencia lo anterior? * A: A la ley de las proporciones definidas
B: A la ley de las proporciones múltiples
C: A la ley de la conservación de la masa
D: A la ley de las proporciones recíprocas
E: A la ley de los volúmenes de combinación

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

Which property of water causes water drops to bead on a freshly waxed car?

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)