you and your lab partner are asked to determine the density of an aluminum bar. the mass is known accurately to 4 significant figures. you use a simple metric ruler to determine its size and calculate the results in column a. your partner (using a precision micrometer for the first time) obtains the results in column b. (the accepted density of aluminum is 2.702 g/cm3.)

method a results (g/cm3) method b results (g/cm3)

2.2 2.603

2.3 2.601

2.7 2.605

2.4 2.611

calculate the average density for each method.

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

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

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned