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Class 12 Exam  >  Class 12 Questions  >  A Certain Zeroth Order reaction has k = 0.025... Start Learning for Free
A Certain Zeroth Order reaction has k = 0.025 Ms-1 for the disappearance of A. What will be the concentration of A after 15s, if the intial concentration is 0.50 M?
  • a)
    0.50 M
  • b)
    0.375 M
  • c)
    0.125 M
  • d)
    0.060 M
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
A Certain Zeroth Order reaction has k = 0.025 Ms-1for the disappearanc...
 
x (product) formed after 15 s = 0.025 Ms-1 x 15s= 0.375 M Then, reactant left = 0.500 - 0.375= 0.125 M
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A Certain Zeroth Order reaction has k = 0.025 Ms-1for the disappearanc...
Given Information:
- Zeroth order reaction
- Rate constant (k) = 0.025 Ms^-1
- Initial concentration of A = 0.50 M
- Time (t) = 15 s

Explanation:
The rate equation for a zeroth order reaction is given by:

Rate = k[A]^0 = k

Since the reaction is zeroth order, the rate of the reaction is independent of the concentration of A. This means that the rate of reaction remains constant throughout the reaction.

To calculate the concentration of A after a certain time (t), we can use the following equation:

[A]t = [A]0 - kt

Where:
[A]t = concentration of A at time t
[A]0 = initial concentration of A
k = rate constant
t = time

Substituting the given values into the equation:

[A]t = 0.50 M - (0.025 Ms^-1)(15 s)
[A]t = 0.50 M - 0.375 M
[A]t = 0.125 M

Therefore, the concentration of A after 15 seconds will be 0.125 M.

Answer:
The concentration of A after 15 seconds is 0.125 M.
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Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.In the following questions, a statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion: Reactions can occur at different speeds.Reason: Rate of reaction is also called speed of reaction.

Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.In the following questions, a statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion: For a reaction: P + 2Q → Products, Rate = k [P]1/2[Q]1 so the order of reaction is 1.5Reason: Order of reaction is the sum of stoichiometric coefficients of the reactants.

A Certain Zeroth Order reaction has k = 0.025 Ms-1for the disappearance of A. What will be the concentration of A after 15s, if the intial concentration is 0.50 M?a)0.50 Mb)0.375 Mc)0.125 Md)0.060 MCorrect answer is option 'C'. Can you explain this answer?
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