Suppose that the unknown peak and the is have an rf of 0.81. if injection of a sample containing 50 ppm is gives peak areas of 8230 for the unknown and 12,410 for the is. what is the unknown concentration in ppm?

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.