We’re being asked to **calculate the rate of appearance of Br _{2}**

2HBr (g) → H _{2} (g) $+$ Br_{2} (g)

Recall that for a reaction **aA → bB**, the ** rate of a reaction** is given by:

$\overline{){\mathbf{Rate}}{\mathbf{=}}{\mathbf{-}}\frac{\mathbf{1}}{\mathbf{a}}\frac{\mathbf{\Delta}\mathbf{\left[}\mathbf{A}\mathbf{\right]}}{\mathbf{\Delta t}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{b}}\frac{\mathbf{\Delta}\mathbf{\left[}\mathbf{B}\mathbf{\right]}}{\mathbf{\Delta t}}}$

where:

**Δ[A]** = change in concentration of reactants or products (in mol/L or M)

**Δt** = change in time

The rate of disappearance of HBr in the gas phase reaction

2HBr (g) → H _{2} (g) $+$ Br_{2} (g) is 0.602 M s^{-1 }at 150°C. The rate of appearance of Br_{2} is _____ M s^{-1} .

a) 1.20

b) 0.602

c) 0.0906

d) 0.301

e) 0.151

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What scientific concept do you need to know in order to solve this problem?

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