chemistry
posted by melissa .
the halflife of polonium218 is 3.0 minutes. what percentage of the original sample remains after 4 halflives?

chemistry 
bobpursley
amount left= (1/2)^4=1/2^4=1/4^2=1/16

chemistry 
bob
The halflife of polonium218 is 3.0 min. If you start with 16 mg of
polonium218, how much time must pass for only 1.0 mg to remain? 
chemistry 
no
nohonob
Respond to this Question
Similar Questions

Chemistry
Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 10 years? 
chemistry
If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in minutes? 
Chemistry
Po218 is an alpha emitter with a halflife of 3.0 minutes. If a sample contains 42 mg of Po218, how many alpha emissions would occur in 6.0 minutes? 
chemistry
an original sample of K40 has a mass of 25.00 grams. After 3.9x 10 to the ninth years, 3.125 grams of the original sample remains unchanged. What is the halflife ok K40 in minutes? 
chemistry
Find the number of disintegrations per minute emitted by 1.1 mol of 232Th in 1 min. The halflife of 232Th is 1.4 x 1010 year I was able to do this with the following technique: 1.1 x 6.022 x10^23 =6.62x10^23 1.4x10^10=7.358x10^15 … 
Science math
Suppose a laboratory has a 38 g sample of polonium210. The halflife of polonium210 is about 138 days. How many halflives of polonium210 occur in 1104 days? 
science
Suppose a laboratory has a 31 g sample of polonium210. The halflife of polonium210 is about 138 days. How many halflives of polonium210 occur in 966 days? 
sciencemath
Suppose a laboratory has a 31 g sample of polonium210. The halflife of polonium210 is about 138 days. How many halflives of polonium210 occur in 966 days? 
algebra
Consider that the halflife of Polonium210 is 140 days.What approximate daily percentage of decay does Polonium210 demonstrate? 
chemisty
What is the halflife of polonium218 if 5.37 minutes are required for the activity of a sample of polonium218 to fall to 29.5 percent of its original value?