Ask a New Question

Question

If a sample of Sr-90 initially contains 1.1 mmol of Sr-90, how many millimoles are left after 25.20 years?

any ideas on where to start??
13 years ago

Answers

DrBob222
Yes.
See your post above.
First calculate k using the half life, then use
ln(No/N) = kt
Use No = 1.1 mmol
N = unknown
k from half life
t = 25.2
13 years ago

Related Questions

A radium-226 sample initially contains 0.112mol. How much radium-226 is left in the sample after 640... if a gas is initially at 1.5 atm of pressure, Occupies a volume of 3.0 L at a tmepeature of 293K, wh... A sample of sand initially at 22.3°C absorbs 1.34 x 10^3 J of heat. The final temperature of sand is... A radioactive sample initially contains N- atoms. After three half lives the number of atoms that... A sample of argon initially has a volume of 5.0 L and the pressure is 2 atm. If the final temperatur... A 0.300-kg of ice is initially at temperature of −8.0 °C. How much heat is required to melt three-qu... Initially, we have 200 g of a radioactive substance. If the mass of the substance is decaying by 7%... A sample initially contain 80.0g of an isotope after 24.0hrs only 5mg of the sample was left what is... Initially, there were only 197 weeds at a park. The weeds grew at a rate of 25% each week. The follo... A sample of argon-39 initially weighed 1578 grams. After 538 years, the sample's mass reduced to 394...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use