help
posted by Anonymous .
the halflife of a radium is 1690 years is 90 grams is present now, how much will be present in 70 years

(90 g)* 2^(70/1690)
= 90g * 0.9717 = 87.5 g
Respond to this Question
Similar Questions

Chem 3A
please help me with this chemistry problem. HalfLife A radium226 sample initially contains 0.112 mol. How much radium226 is left in the sample after 6400 years? 
Math  Exponential Decay
Radium decays exponentially. Its halflife is 1,690 years. How long will it take for a 50gram sample of radium to be reduced to 5 grams? 
Chemistry
Uranium238 has half life of 4.51 * 10^9 years Uranium234 has half life of 2.48 * 10^5 years Thorium230 has half life of 8.0 * 10^4 years Radium226 has half life of 1.62 * 10^3 years Lead210 has half life of 20.4 years. The rate … 
MATHS
experiments show that radium disintegrates at a rate proportional to the amount of radium present at the moment . if half life is 1590 years what percentage will disappear in one year? 
MATHS
please help me ...Experiments show that radium at rate proportional to the amount of radium present at the moment . if half life is 1590 years what percentage will disappear in one year ? 
Physics
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil? 
Intermediate Maths
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil? 
Final Maths
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil? 
physics
the half life of radium is 1600 years of 100 grams of radium existing now 25 grams will remain after how many years 
Physics
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil?