Chemistry
posted by Lily .
The most abundant isotope of the element nobellum has a halflife of 58 minutes. After 174 minutes the sample has a mass of .300 mg. What was the orignal mass of the sample?
A. 1.20 mg
B. 4.80 mg
C. .600mg
D. 2.40 mg
Respond to this Question
Similar Questions

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
use the nuclear decay equation to find out how much a 7mg sample of iodine 128 remains after 116 minutes if the half life of this isotope is 25 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? 
math30
The mass of a radioactive sample is represented in the graph below. The initial mass of 32 mg decays to 8 mg after 21 hours. 1)What is the halflife of the radioactive sample, in minutes? 
math grade 12
2. An isotope of sodium has a halflife of 15 h. A sample of this isotope has a mass of 2 g. a. [2] Find the mass equation that remains after t hours. b. [1] Find the mass that remains after 5 hours, to the nearest hundredth. c. [2] … 
College Algebra
Use a calculator to help solve the problem. One isotope of holmium, 162Ho, has a half life of 22 minutes. The halflife of a second isotope, 164Ho, is 37 minutes. Starting with a sample containing equal amounts, find the ratio of the … 
college algebra
One isotope of holmium, 162Ho, has a half life of 22 minutes. The halflife of a second isotope, 164Ho, is 37 minutes. Starting with a sample containing equal amounts, find the ratio of the amounts of 162Ho to 164Ho after one hour. … 
chemistry
isotope chromium 51 has a half life of 28 days. If the original sample had a mass of 28.0 grams, what mass of chromium 51 sample remains after 84 days? 
Chemistry
If a 40 gram sample of radioactive isotope was present at 4pm, but a 5 gram sample remained at 4:30 pm, what is the halflife in minutes? 
Physics (Inside the atom)
A sample of radioactive isotope I is to be used for medical diagnosis of the kidneys. The isotope has a halflife of 8.0 days, and the sample is required to have an activity of 8 x 10^5 per second at the time it is given to the patient. …