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g after 3.8 years. Th-228 has a half-life of 1.9 years. If you initially have 1.5...
change the answer 10. (0/5 points) DETAILS PREVIOUS ANSWERS The half-life of isotope 228 Th is 1.913 years. Calculate the activity of 7e-069 of this isotope in B and C: 90 A= 362 XBq and A ci. Find the activity of this sample after 8 years: C. Submit Answer View Previous Question Question 10 of 11 View Next Question Home My Assignments Request Extension
If a substance has a half-life of 3.70 days, and there are initially 50.0 g of the substance, how many grams will remain after precisely three weeks? Report your answer with three significant figures.
h= half life
a0 = original amount
a(t) = amount present after t years
t = time
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TH 100 - D100 Use equation : acca un Page 4 of 5 4. Suppose we have Xo amount of a certain radioactive substance. It has been observed that this substance losses 5% of its mass every 10 years. @ How much of the initial mass Xo remains after 10 years? What about 20 years? (b) Use the...
The Cs-131 nuclide has a half-life of 30 years. After 120 years, 8.7 g remain. What is the original mass of the Cs-131 sample?
Cesium-137 has a half-life of 30 years. If you start with 1.0 g of 137Cs, how much 137Cs will be remaining after 60 years? O 0.30 g O 0.50 g O 0.90 g O 0.00 g O 0.25 g SUBMIT
The half-life for the
radioactive decay of C-14 is 5730 years. You may want to reference
(Pages 598 - 605) Section 14.5 while completing this problem.
Exercise 14.58 - Enhanced with Feedback 26 of 48 Review I Constants I Periodic Table The half-life for the radioactive decay of C-14 is 5730 years Part A You may want to reference (Pages 598 605) Section 14.5 while completing this problem. How long will it take for 30% of the C-14 atoms in...
You have 82.173g of a radioactive element with a half-life of 53.39minutes. After 4.05 half-lives have passed, how many grams of the radioactive element remain? Report your answer to 2 decimal places. Answer 4.96
You have 86.237g of a radioactive element with a half-life of 43.91minutes. After 3.09 half-lives have passed, how many grams of the radioactive element remain? Report your answer to 2 decimal places.
QUESTION 16 10p] has a half-life of 223 years and decays to produce 2064g. If you start with 7.50 g 0210pa. how many grams of 206Hg will you have after 17.5 years? A 4.35 B.3.15 C 3.09 D. 0.0600 O E 1.71
If a substance has a half-life of 1.90 days, and 500.0 g of the substance are initially present, how many grams will remain after precisely one week? Select the correct answer below: 14.9 g 38.8 g 57.9 g 125.1 g