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# A first order reaction has a rate constant 1.15 10-3 s-1. How long will 5g of this reactant take to reduce to 3g? - CBSE (Science) Class 12 - Chemistry

ConceptFactors Influencing Rate of a Reaction

#### Question

A first order reaction has a rate constant 1.15 10−3 s−1. How long will 5 g of this reactant take to reduce to 3 g?

#### Solution

From the question, we can write down the following information:

Initial amount = 5 g

Final concentration = 3 g

Rate constant = 1.15 10−3 s−1

We know that for a 1st order reaction,

t = 2.303/k log""([R]_0)/[R]

= 2.303/(1.15xx10^(-3))log  5/3

= 2.303/(1.15xx10^(-3)xx0.2219

= 444.38 s

= 444 s (approx)

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Solution A first order reaction has a rate constant 1.15 10-3 s-1. How long will 5g of this reactant take to reduce to 3g? Concept: Factors Influencing Rate of a Reaction.
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