chemistry tutor in dwarka

 Chemistry tutor in dwarka sector 1,2,3,4,5,6,7,8,9,10,11,12
Call 9958510549

Chemical kinetics

Q. Define :- 1. Order the reaction 2. Elementary step in a reaction 3. Rate law  4.  Rate constant   5.molecularity.
Q. Afirst order has a rate constant value of 0.00510 /min . if we begin with 0.10M concentration of the reactant , how much of the rectant will remain after 3 hours?
Q. identify the order of a reaction if the units    1. Mol/L/s     2. L/mol/s
 Q. the thermal decomposition of Hco2H is a first order reaction with a rate constant of 2.4 X 10-3 /s at a certain temperature. Calculate how long will take for three forths of initial quantity of Hco2H to decompose.[log 0.25= -0.6021]
Q. The activation energy for the reaction 2HI----( H2 + I2 is 209.5 kj/mol at 581 k . calculate the fraction of molecules having energy equal to or greator than activation energy.[R=8.31 j/k/mol]
Q. Show that first order reaction the time required for half the change is independent of initial concentration.
Q The rate of reaction increases four times when the temp. changes from 300 k to 320 k. calculate the energy of activation of the reaction.[R=8.314j/mol/k]
Q. The decomposition of PH3
4PH3----( P4  +   6H2
Rate =k[PH3]
The half life of PH3 is 37.9 s at 120 degree celcius .
How much time is required for ¾ th PH3 to decompose.
What fraction of the original sample of PH3 remains behind after 1 minute?
Q. A reaction is at first order in reactant A and of second order in reactant B . How is the rate of this reaction affected when      1. The concentration of B is increased A as well as B are doubled?
Q. The rate constant for a reaction of Zero order in a A is 0.0030 mol/l/s How long will it take for the initial conc of A to fall from 0.10M to 0.075M?