If a sample has 25% parent and 75% daughter, how many halflifes have gone by?

Chemistry

1 answer:

Anit [1.1K]2 years ago

6 0

Answer:

Two half lives.

Explanation:

It is known that the decay of isotopes and radioactive material obeys first order kinetics.

Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

That means for a sample 100% to decay to 50 % it will take one half-life, and to decay the remaining 50% to 25% it will take another half-life.

So, for a sample has 25% parent and 75% daughter it will have two half-lives.

You might be interested in

This is the speed at which molecules or atoms move dependent on temperature and state of matter.

Lynna [10]

Molecular Motion is the speed at which molecules or atoms move dependent on temperature and state of matter.

Explanation:

All molecules are in constant motion. Molecules of a liquid have a lot of freedom of movement than those in an exceedingly solid. Molecules in an exceedingly gas have the best degree of motion.

Heat, temperature and also the motion of molecules area unit all connected. Temperature could be a life of the common K.E. of the molecules in an exceedingly material. Heat is that the energy transferred between materials that have completely different temperatures. Increasing the temperature will increase the travel motion of molecules Energy is expounded to temperature by the relationship.

3 0

2 years ago

Read 2 more answers

Determine the AMOUNT OF NO2, LIMITING REACTANT, AND THE AMOUNT AND NAME OF EXCESS REACTANT.

zepelin [54]

Answer:

balanced equation mole ratio 5 2 mol NO/1 mol O2

10.00 g O2 3 1 mol O2/32.00 g O2 5 0.3125 mol O2

20.00 g NO 3 1 mol NO/30.01 g NO 5 0.6664 mol NO

actual mole ratio 5 0.6664 mol NO/0.3125 mol O2 5 2.132 mol NO/1.000 mol O2

Because the actual mole ratio of NO:O2 is larger than the balanced equation mole

ratio of NO:O2, there is an excess of NO; O2 is the limiting reactant.