Cesium-124 has a half-life of 30.9 s. a) How many Cs-124 nuclei are in 19 micrograms...

Cesium-124 has a half-life of 30.9 s.

a) How many Cs-124 nuclei are in 19 micrograms of said isotope?

b) How about after 2.4 min?

c) How strong is its activity then?

d) After which time has activity dropped below 1.0 Bq?

Expert Solution

genius_generous answered 1 year ago

Question 5 - Half Lives: Radioactive cesium (Cs-137) is one of many possible by-products of a...

Question 5 - Half Lives: Radioactive cesium (Cs-137) is one of many possible by-products of a nuclear meltdown. The half-life for the decay of Cs-137 is 30.17 yr, what is the rate constant for its decay in yr-1? Enter the numerical answer in decimal format, do not include the units. For a first order reaction how many half-lives (t1/2) must pass for the concentration of the reactant to reach 1/8 of its original amount? For a first order reaction having...

32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 30.9...

32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 30.9 g of 32P, how much 32P was present 9.00 days ago?

The half life of 14C is 5730 years. What fraction of the 14C nuclei in a...

The half life of 14C is 5730 years. What fraction of the 14C nuclei in a sample are left after 8140 years?

The half-life of cesium-137, released as a result of the Fukushima Daiichi nuclear disaster, is 30.2...

The half-life of cesium-137, released as a result of the Fukushima Daiichi nuclear disaster, is 30.2 years. Determine the number of years it would take for the amount of cesium-137 to decrease to 7 % of the original amount released in the disaster. Round your answer to the nearest number of years.

The half-life of 27Mg is 9.50 min. (a) Initially there were 4.80 × 1012 27Mg nuclei...

The half-life of 27Mg is 9.50 min. (a) Initially there were 4.80 × 1012 27Mg nuclei present. How many 27Mg nuclei are left 15.5 min later? × 10 nuclei Enter your answer in scientific notation. b) Calculate the 27Mg activities (in Ci) at t = 0 and t = 15.5 min. t = 0 Ci t = 15.5 Ci

Radium-226 has a half-life of 1,600 years. How many disintegrations would be measured given in a...

Radium-226 has a half-life of 1,600 years. How many disintegrations would be measured given in a 1.5 mg sample of Radium-226 per day?

1) A first-order reaction has a half-life of 15.5 s . How long does it take...

1) A first-order reaction has a half-life of 15.5 s . How long does it take for the concentration of the reactant in the reaction to fall to one-eighth of its initial value? 2) The rate constant for a certain reaction is k = 4.30×10−3 s−1 . If the initial reactant concentration was 0.350 M, what will the concentration be after 8.00 minutes?

Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half-lives would go by...

Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half-lives would go by in 22 h?

Half-life equation for first-order reactions: t1/2=0.693k where t1/2 is the half-life in seconds (s), and k...

Half-life equation for first-order reactions: t1/2=0.693k where t1/2 is the half-life in seconds (s), and k is the rate constant in inverse seconds (s−1). A. What is the half-life of a first-order reaction with a rate constant of 5.60×10−4 s−1? B. What is the rate constant of a first-order reaction that takes 150 seconds for the reactant concentration to drop to half of its initial value? C. A certain first-order reaction has a rate constant of 7.20×10−3 s−1. How long...

How many vibrational modes does an SO3 molecule have (a) in the plane of the nuclei,...

How many vibrational modes does an SO3 molecule have (a) in the plane of the nuclei, (b) perpendicular to the molecular plane?

Question