NEET Chemistry Chemical Kinetics Questions Solved

NEET - 2009

For the reaction, N2 + 3H2 2NH3, if d[NH2]/dt = 2x10-4 mol L-1s-1, the value of -d[H2]/dt would be 

(a) 3x10-4 mol L-1s-1

(b) 4x10-4 mol L-1s-1

(c) 6x10-4 mol L-1s-1

(d) 1x10-4 mol L-1s-1

Key Idea Rate of disappearance of reactant

= - 1/stoichiometry coefficient of the reactant x change in conc of reactant / time taken

Rate of appearance of product

= 1/stoichiometry coefficient  x change in conc of product / time taken

For the reaction, 

N2+3H2  2NH3

Rate = -[N2]/dt = -1/3d[H2]/dt = +1/2d[NH3]/dt

or -1/3d[H2]/dt = +1/2d[NH3]/dt

-d[H2]/dt = 3/2 x 2x10-4 molL-1s-1

=3x10-4 molL-1s-1

Difficulty Level:

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