Chemical Engineering - Chemical Reaction Engineering - Discussion
Discussion Forum : Chemical Reaction Engineering - Section 5 (Q.No. 4)
4.
What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on ?
Discussion:
15 comments Page 1 of 2.
THOSIN said:
12 months ago
This reaction is a zero-order reaction because if we assume zero order, r = -dc/dt = kc^0 = k,
-dc = kdt, -c = kt + p, at t=0, c=c0, -c0 = p and -c = kt - c0.
c0 - c = kt, but c0 - c = xc0, hence, xc0 = kt and c0 = k/xt which is a linear relationship.
Since t/x is constant at any value.
Hence, for a zero-order reaction, k and r has the same unit which is moldm^-3s^-1 or mol l^-1 s^-1.
-dc = kdt, -c = kt + p, at t=0, c=c0, -c0 = p and -c = kt - c0.
c0 - c = kt, but c0 - c = xc0, hence, xc0 = kt and c0 = k/xt which is a linear relationship.
Since t/x is constant at any value.
Hence, for a zero-order reaction, k and r has the same unit which is moldm^-3s^-1 or mol l^-1 s^-1.
Alpesh Solanki said:
5 years ago
Here Rate constant is directly proportional to time that is conversation 10, 29, 30 % in 1, 2, 3 hr respectively so 1st order reaction.
Anandhu said:
5 years ago
B is the correct answer because it's a zero-order reaction. Unit of the rate constant is ((Moles/Litre)^1-n)/second.
Yaduvanshi said:
5 years ago
you are right @Ankit.
@Anmol.
You have to know the unit of zero-order reaction constant.
@Anmol.
You have to know the unit of zero-order reaction constant.
Peprah said:
5 months ago
How is this a zero-order reaction and not a first-order reaction?
Anyone, please explain.
Anyone, please explain.
TANMAY SHAH said:
2 years ago
@All.
How can we say that this is Zero order reaction? Please, anyone explain to me.
How can we say that this is Zero order reaction? Please, anyone explain to me.
SATYA prakash said:
2 years ago
The unit of rate constant for zero order must be mol/lit Sec.
So, the answer is B.
So, the answer is B.
(1)
Harsh said:
2 years ago
Agree, Option A is correct according to Zero order of the reaction.
Robin Simeon said:
2 years ago
It is a zero-order reaction, So I think the correct answer is B.
Anmol said:
9 years ago
Zero order reaction so the answer is A.
(1)
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