Uranium-232 has a half life of 68.8 years. after 344.0 years, how much uranium-233 will remain from a 100.0-g sample?

I think in the question you should have to find how much Uranium-232 will be left as half life of Uranium- 233 is about 1,60,000 years and will not decay much and the necessary data for that is also not provided in the question!

Uranium-232 has a half life of 68.8 years.

So, it becomes half of its current amount in 68.8years

In another 68.8 years it will become it will become 1/2 of the remaining amount .

So, in 68.8*5 or 344 years it becomes 1/2*1/2*1/2*1/2*1/2 of the present amount.

i.e. (1/2)^5 of the current amount

i.e. 1/32 of current amount.

Our sample here has 100 gm of Uranium-232,

So, it will become 100*1/32 in 344 years.

or it will become 3.125 gm

Ans) 3.125 gm

Hope it helps!!!

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation: