Answer Happy

Which phrase best describes reaction rate? choose the letter
a. time it takes for all products to form
b. time it takes fro all reactants to form
c. measure of amount of product that forms
Ammonia is formed from the reaction of nitrogen and hydrogen molecules. N2 + 3H2 → 2NH3 AH= -90 kJ The reverse reaction of decomposition of ammonia occurs when molecules receive enough energy. 2NH3 + N2 + 3H2 AH= +90 kJ The figure shows the energy diagram for these reactions. Energy N2 + 3H2 2NH3 forward reaction reverse reaction Course of reaction 16. Which phrase best describes reaction rate? Circle the letter of the correct answer. A. the time it takes for all products to form B. the time it takes for all reactants to disappear C. a measure of amount of product that forms D. a measure of the frequency of effective collisions