河北科技大学化学与制药工程学院：《化学计量学》课程PPT教学课件（讲稿）第一章 练习

unit 1: PROBLEMS c1.a reaction has the stoichiometric equation a+B=2R. What is the order of reaction? c2. A reaction with stoichiometric equation a+b=r+is has the following rate expression ra=2CAC What is the rate expression for this reaction if the stoichiometric equation is written as a+2B =2R+S?

UNIT 1: PROBLEMS 1 . A reaction has the stoichiometric equation A+B=2R. What is the order of reaction? 2. A reaction with stoichiometric equation has the following rate expression What is the rate expression for this reaction if the stoichiometric equation is written as A+2B=2R+S? A B R S2 1 2 1 + = + A CA CB r 0.5 = 2

unIT 1: PROBLEMS 63 For a gas reaction at 400K the rate is reponed as dp 3.66 atm/h dt c(a What are the units of the rate constant? e( b) What is the value of the rate constant for this reaction if the rate equation is expressed as s、dC=kC2,mol(Lh) dt

UNIT 1: PROBLEMS 3 . For a gas reaction at 400K the rate is reported as (a) What are the units of the rate constant? (b) What is the value of the rate constant for this reaction if the rate equation is expressed as 3.66 , atm/h 2 A A p dt dp = , mol/(L h) 2 = − =  A A A k C dt dC r

unIT 1: PROBLEMS 64. The pyrolysis of ethane proceeds with an activation energy of about 315000 J. How much faster is the decomposition at 650C than500℃? 65. a certain reaction has a rate given b r4=0.005C4,molm If the concentration is to be expressed in mo/ and time in hours what would be the value and units of the rate constant?

UNIT 1: PROBLEMS 4.The pyrolysis of ethane proceeds with an activation energy of about 315000 J. How much faster is the decomposition at 650℃ than 500℃? 5. A certain reaction has a rate given by If the concentration is to be expressed in mol/L and time in hours, what would be the value and units of the rate constant? 0.005 , mol/cm min 2 3 =  A CA r

unIT 1: PROBLEMS ●6 On typical summer days fields crickets nibble, jump, and chirp now and then. But at night when great numbers congregate chirping seems to become a serious business and the chirp rate becomes quite regular. In 1897 Dolbear reported that not only was it regular but that the rate was determined by the temperature as given by (number of chirps in 15 secs)+5=(temperature, C) Assuming that the chirping rate is a direct measure of the metabolic rate, find the activation energy of these crickets in the temperature rang of 10 to 30C

UNIT 1: PROBLEMS 6. On typical summer days fields crickets nibble, jump, and chirp now and then. But at night when great numbers congregate chirping seems to become a serious business and the chirp rate becomes quite regular. In 1897 Dolbear reported that not only was it regular but that the rate was determined by the temperature as given by (number of chirps in 15 secs)+5=(temperature, ℃) Assuming that the chirping rate is a direct measure of the metabolic rate, find the activation energy of these crickets in the temperature rang of 10 to 30℃