A particular reactant decomposes with a half-life of 121 s when its initial concentration is 0.357 M. The same reactant decomposes with a half-life of 235 s when its initial concentration is 0.184 M.

What is the value and unit of the rate constant for this reaction?

Answer : The value and unit of the rate constant for this reaction is, and respectively.

Explanation :

As we know that half-life of zero-order and second-order reaction depend on the concentration of reactant while the half-life of first-order reaction is independent of the concentration of the reactant.

The expression of half-life for zero order reaction:

The expression of half-life for first order reaction:

The expression of half-life for second order reaction:

The given reaction can not be first order reaction because it is independent of the concentration of the reactant.

So, the given reaction can be zero order or second order.

First we have to calculate the value of rate constants for zero order.

and,

From this we conclude that the reaction can not be zero order.

Now we have to calculate the value of rate constants for second order.

and,

From this we conclude that the reaction is a second order.

Therefore, the value and unit of the rate constant for this reaction is, and respectively.

to make a supersaturated solution, make a saturated solution of sugar by adding 360 grams of sugar to 100 ml of water at 80 degrees celsius. when the water cools back down to 25 degrees, that 360 grams of sugar will still be dissolved even though the water should only dissolve 210 grams of sugar.

bcde is the incorrect answer it is a