Americium-242 has a half-life of 6 hours. If you started with 24 g and you now have 3 g, how much time
has passed?

The time required by Americium-242 to reduce to 3 grams from 24 grams has been 18 hours.

Half-life can be described as the time required by the substance to reduce to half of its initial concentration.

The half-life can be expressed as:

Final concentration = Initial concentration

0.125 =

0.125 can be written as:

0.125 =

Since the bases are same:

3 =

t = 18 hours.

The time required by Americium-242 to reduce to 3 grams from 24 grams has been 18 hours.

For more information about the half-life refer to the link:

link

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but