Thursday
July 31, 2014

Homework Help: Chem 2

Posted by Kristina on Thursday, July 21, 2011 at 9:55pm.

The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.

a) How long will it take for 10% of the U-238 atoms in a sample of U- 238 to decay?

b)If a sample of U-238 initially contained 1.91018 atoms when the universe was formed 13.8 billion years ago, how many U-238 atoms will it contain today?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chem - Pu-238 is radioactive by alpha-decay (half-life 87.7 y). Each decay ...
Chemistry - Pu-238 is radioactive by alpha-decay (half-life 87.7 y). Each decay ...
chemistry - How long will it take for 25% of the C-14 atoms in a sample of C-14 ...
Math - D.E.Q. - The half-life of a radioactive isotope is the amount of time it ...
chem - Radioactive substances decay by first-order kinetics. How many years ...
Chemistry - Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half ...
Chemistry - Geologists can estimate the age of rocks by their uranium-238 ...
chemistry - Radioactive decay is a process that follows first-order kinetics. ...
Calculus - The half life of a certain radioactive substance is 10 years. How ...
geology - How old are the oldest meteorites yet studied and what is the minimum ...

Search
Members