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A first order reaction has a …

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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?

    • Posted by Yuvraj Yadav 4 years, 9 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Gaurav Seth 4 years, 9 months ago

    It will take 444 seconds for 5g of this reactant take to reduce to 3g

    Explanation:

    Expression for rate law for first order kinetics is given by:

    where,

    k = rate constant  =

    t = time for decomposition

    a = initial amount of the reactant  = 5 g

    a - x = amount left after decay process = 3 g  

    Putting in the values we get:

    1Thank You

    Gaurav Seth 4 years, 9 months ago

    Given that 
    Initial quantity, [R]o= 5 g
    Final quantity, [R] = 3 g 
    Rate constant, k = 1.15 x 10−3 s−1
    Formula of 1st order reaction,
    We know that
                  

    or           
                    

    1Thank You

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