Chemistry: Tellme your age and you get brainliest answer

Tellme your age and you get brainliest answer

gonzaleze18

30.10.2020

29.0 years

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{12.5years}=0.0554years^{-1}$

b) for decomposition of 80 % of reactant

$t=\frac{2.303}{0.0554}\log\frac{100}{100-80}$

$t=\frac{2.303}{0.0554}\log\frac{100}{20}$

t=29.0 years

The age of a suspected vintage wine that is 20 % as radioactive as a freshlybottled specimen is 29.0 years

0,0(0 оценок)