HW13_#5 PLEASE SHOW ALL WORK To understand zero-order reactions. Chemical kineti
ID: 925542 • Letter: H
Question
HW13_#5 PLEASE SHOW ALL WORK
To understand zero-order reactions. Chemical kinetics is the study of the speed with which a chemical reaction occurs and the factors that affect this speed. The speed of a reaction is the rate at which the concentrations of reactants and products change. This relationship is expressed through rate laws. For a general reaction aA + bB Right arrow gG + hH, the rate law is given as rate of reaction =k[A]m[B]n where the coefficients m and n are experimentally determined while a, b, g, and h are stoichiometric coefficients unrelated to m and n. A zero-order reaction has a rate law in which the sum of the exponents m + n + ... is equal to zero. Thus, the rate of reaction is independent of the concentration of the reactants. For a zero-order reaction, the graph of reactant concentration versus time is a straight line. Therefore, the rate-law equation for a zero-order reaction can be compared to that of a straight line, y = mx + b. A zero-order reaction is independent of the concentration of the reactants. Zero-order reactions have the following features: The concentration versus time graph is a straight line with a negative slope; this negative slope represents the rate constant of a reaction. The rate of the reaction is equal to the rate constant. The units of k and the rate of reaction are mol . L 1 . s-1. Photochemical reactions and surface reactions are examples of zero-order reactions. In the hydrogenation of ethylene using a nickel catalyst, the initial concentration of ethylene is 1.85 mol . L-1 and its rate constant (k) is 0.0013 mol . L_1 . s-1 . Determine the rate of reaction if it follows a zero-order reaction mechanism. Express your answer to two significant figures and include the appropriate units.Explanation / Answer
for zero order reaction : rate = k [reactant]^0 = k x 1
rate = k
rate = 0.0013 mol .L-1 s-1
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.