What is the half life if 500 grams decays to 125 grams in 25years?
with steps pls

The half life of the sample is 60.26 years.

Explanation:

All radioactive decay reactions follow first order reaction.

The formula used to calculate the rate constant for a first order reaction follows:

where,

k = rate constant = ?

t = time period = 25 years

a = initial concentration of the reactant = 500 g

a - x = concentration of reactant left after time 't' = (500 - 125) = 375 g

Putting values in above equation, we get:

Now, to calculate the half life period of the reaction, we use the equation:

where,

= half life period of the reaction = ?

k = rate constant =

Putting values in above equation, we get:

Hence, the half life of the sample is 60.26 years.

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.