83ef0c8 reaction A → 3B , the [A] changes from 1.00
0.0 ثانية
at 0.00 s to 0.50 mol/L at 2.00 s
571/
من بمولات
What is the average reaction rate in moles of A
consumed per liter per second?

0.17325 moles per liter per second

Explanation:

For a first order reaction;

in[A] = in[A]o - kt

Where;

[A]= concentration at time t

[A]o = initial concentration

k= rate constant

t= time taken

ln0.5 =ln1 - 2k

2k = ln1 - ln0.5

k= ln1 - ln0.5/2

k= 0 -(0.693)/2

k= 0.693/2

k= 0.3465 s-1

Rate of reaction = k[A]

Rate = 0.3465 s-1 × 0.50 mol/L

Rate = 0.17325 moles per liter per second

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.