Expressing rate in terms of changes in
[reactant] and [product]
H2(g) + I2(g) 2HI(g)
rate = - D[H2]/Dt = - D[I2]/Dt = 1/2 D[HI]/Dt
rate = D[HI]/Dt = -2 D[H2]/Dt = -2 D[I2]/Dt
or
The mathematical expression for the rate, and the numerical value of
the rate, depend on which substance is chosen as the reference.
For the general reaction: aA + bB cC + dD
rate = -1/a D[A]/Dt = -1/b D[B]/Dt = 1/c D[C]/Dt = 1/d D[D]/Dt
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