half life, Chemistry

Assignment Help:
A 64-g sample of germanium-66 is left undisturbed for 12.5 hours. At the end of that period, only 2.0 g remain. What is the half-life of this material?
4. With a half-life of 28.8 years, how long will it take for 1000 mg of strontium-90 to decay to 125mg?
5. Cobalt-60 has a half-life of 5.3 years. If a pellet that has been in storage for 26.5 years contains 14.5 g of cobalt-60, how much of this radioisotope was present when the pellet was put into storage?
6. A 1000 g block of phosphorus-32, which has a half-life of 14.3 days, is stored for 100.1 days. At the end of this period, how much phosphorus- 32 remains?

Related Discussions:- half life

Yield, Hi I need ur help Thank you CuCo3+2HCl=CuCl2+CO3+H2O What mass of c...

Hi I need ur help Thank you CuCo3+2HCl=CuCl2+CO3+H2O What mass of cucl2 with react completely with 20 cm3 of 2000 mol cm3 of HCl? Calculate the % yield if 8.5g of chloride was pro

Thermochemistry, a 60.0g sample of water initially at 40.0 degree celcius i...

a 60.0g sample of water initially at 40.0 degree celcius is heated and converted to steam at 100 degree celcius. how much heat has been supplied to the sample during the pross. giv

Illustrate kinetic theory of matter, Q. Explain  heat according to kinetic ...

Q. Explain  heat according to kinetic theory of matter? Ans. On an atomic level the definitions of heat and temperature becomes more precise. According to the kinetic theory of

Electronegative atom on the strength of ionic bond, What is the effect of m...

What is the effect of more electronegative atom on the strength of ionic bond: (1) Decreases (2) Increase (3) Decreases slowly (4) Remains the same Ans:  Increase

Free radical mechanism, define free radical mechanism of additon reaction

define free radical mechanism of additon reaction

When an electron jumps from l to k shell, When an electron jumps from L  ...

When an electron jumps from L  to K  shell: (1) Energy is absorbed   (2) Energy is released  (3) Energy is sometimes absorbed and sometimes  released (4) Energy is nei

Elements, list the elements that have all 3 properties: lustre , malleabbil...

list the elements that have all 3 properties: lustre , malleabbility and conductivity

Find the number of intensive variables, Find the number of intensive variab...

Find the number of intensive variables? Consider the lime-kiln process CaCO 3 (s) → CaO (s) + CO 2 (g) Find the number of intensive variables that can be varied independen

Equilibrium constants, For a general reaction such as: The equilib...

For a general reaction such as: The equilibrium constant is   where the terms [A], [B],...strictly represent activities but are frequently approximated as co

Multi step heat energy problems, You have 9.00 grams of H2O at 263.15 Kelvi...

You have 9.00 grams of H2O at 263.15 Kelvin at 1.00 Atm. How many moles of ice do you have

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd