Astudent measures the mass and volume of a piece of aluminum. the measurements are 25.6 grams and 9.1 cubic centimeters. the student calculates the density of the aluminum. what is the percent error of the student’s calculated density of aluminum?
(1) 1% (3) 3%
(2) 2% (4) 4%

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.