A certain second-order reaction (B→products) has a rate constant of 1.55×10−3 M−1⋅s−1 at 27 ∘C and an initial half-life of 248 s . What is the concentration of the reactant B after one half-life?
1st find the initial concentration
[A]o = 1/(k*half life)
= 1/(1.55*10^-3 M-1.s-1 * 248 s)
= 2.601 M
After half life, concentration decreases to half the value it was before the hallf life
So, after half life,
concentration = initial concentration / 2
= (2.601) / 2
= 1.30 M
Answer: 1.30 M
A certain second-order reaction (B→products) has a rate constant of 1.55×10−3 M−1⋅s−1 at 27 ∘C and...