Question

is second order in b and overall third order, –ra = ______ (2) is zero order in a and first order in b, –ra = ______ (3) is zero order in both a and b, –ra

Answer 1

The rate of a chemical reaction (-ra) will have different expressions depending on the order with respect to reactants 'a' and 'b': for second order in 'b' and third order overall it's -ra = k[a][b]^2; for zero order in 'a' and first order in 'b', it's -ra = k[b]; and for zero order in both, it's -ra = k.

Step-by-step explanation:

The question seems to be asking for expressions that represent the rate of a chemical reaction (-ra) under different conditions of reaction order with respect to two reactants, a and b. The rate law expressions are derived from the principles of chemical kinetics, which describe how reaction rates are affected by the concentration of the reactants. Let me provide the requested expressions for each scenario:

• Second order in b and overall third order: -ra = k[a][b]2
• Zero order in a and first order in b: -ra = k[b]
• Zero order in both a and b: -ra = k (since the rate is independent of the concentration of both reactants)

Here, k represents the rate constant, and the exponents denote the order with respect to each reactant. Remember that these are general forms and the actual rate constant and reaction orders must be determined experimentally.