Kinetics ic study on it but he was careless 6. A student discovered a new molecu

Question

Kinetics
ic study on it but he was careless 6. A student discovered a new molecule and performed a kinetic and lost all his raw data except for the initial rate (1.0 x 10 mole .mole', s.1). He also knows it has a molecular weight of 50 g you calculate the initial amount in d performed a kinetic study on it but he was care ost all his raw data except for the initial rate (1.0 x 103 mole.L.s1 and k (0.50x 10 mole". s). He also knows it has a molecular weight of 50 g.mole1. Using this information mole. Using this information cin on can (lpt) thial amount in gras that h aded to his 500ml reaction fask

Explanation / Answer

We have to find amount of substance that student added in g. For that we can get moles of by using concentration and volume. We are given volume and by using rate law we can calculated the concentration.

From the rate constant we can say that the given order of reaction is “2nd “.

Let the reaction is A---- > B

Rate law : Rate = k [A]2

Lets plug in rate and rate constant values.

[A]2= 1.0E-3 / 5.0 E-4 = 2.0

[A] = 1.41 M

Number of moles of A = molarity x volume in L = 1.41 M x 0.500 L = 0.71 mol

Molar mass of A = 50.0 g /mol

Mass of A required = Number of moles x molar mass = 0.71 mol x 50.0 g/mol = 35.35 g

So the mass of substance should be = 35.35 g

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