Acompound has an empirical formula of c2h6. what additional piece of evidence is needed to determine the molecular formula?
a. percent composition of carbon
b. mass of the sample
c. relative numbers of atoms of each element
d. molar mass of the compound

Which of the following characteristics are true of enzymes? check all that apply. a.)the structure of an enzyme can change if conditions change. b.)a single enzyme can normally catalyze a wide variety of reactions under many conditions. c.)enzymes are found only in nonliving systems. d.)enzymes allow living things to regulate body conditions through feedback mechanisms. e.)enzymes bind to specific substrates in specific ways. f.)enzymes increase the rate of reaction. g.)when shown in energy-reaction diagrams, enzymes represent the higher activation energy.