Question: A first order reaction has a rate constant $1.15 \times 10^{- 3}s^{- 1}$ how long will 5 g of this...

Question

A first order reaction has a rate constant $1.15 \times 10^{- 3}s^{- 1}$ how long will 5 g of this reactant take to reduce to 3 g?

Answer 1

$t = \frac{2.303}{k}\log\frac{R_{0}}{R} = \frac{2.303}{1.15 \times 10^{- 3}}\log\frac{5}{3}$

$= 2.00 \times 10^{3}\log 1.667 = 2 \times 10^{3} \times 0.2219 = 444s$

Question: A first order reaction has a rate constant \(1.15 \times 10^{- 3}s^{- 1}\) how long will 5 g of this...