Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k=1.6 x 10-3 yr-¹. By contrast, phophorus-32, which is used for the analysis of metabolic pathways, has a rate constant for radioactive decay of k = 0.050 day-1 ▼ ▼ Part D How much of a 1.04 mg sample of americium remains after 3 half-lives? Express your answer in milligrams to two significant figures. 15. ΑΣΦ m= Submit Part E m = Submit Request Answer How much of a 2.83 mg sample of phophorus remains after 3 half-lives? Express your answer in milligrams to two significant figures. ΨΕΙ ΑΣΦ Part F Request Answer ? D Π| ΑΣΦ mg How much of a 1.00 mg sample of americium remains after 4 days? Express your answer in milligrams to two significant figures. 11 ? mg
Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k=1.6 x 10-3 yr-¹. By contrast, phophorus-32, which is used for the analysis of metabolic pathways, has a rate constant for radioactive decay of k = 0.050 day-1 ▼ ▼ Part D How much of a 1.04 mg sample of americium remains after 3 half-lives? Express your answer in milligrams to two significant figures. 15. ΑΣΦ m= Submit Part E m = Submit Request Answer How much of a 2.83 mg sample of phophorus remains after 3 half-lives? Express your answer in milligrams to two significant figures. ΨΕΙ ΑΣΦ Part F Request Answer ? D Π| ΑΣΦ mg How much of a 1.00 mg sample of americium remains after 4 days? Express your answer in milligrams to two significant figures. 11 ? mg
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Radioactive Decay in Common Elements**
Americium-241 and phosphorus-32 are two elements used in practical applications due to their radioactive properties. Here's a brief overview of each element and relevant calculations related to their decay.
---
### Americium-241
**Usage**: Americium-241 is widely used in smoke detectors.
**Decay Properties**:
- It has a first-order rate constant for radioactive decay given by \( k = 1.6 \times 10^{-3} \, \text{yr}^{-1} \).
### Phosphorus-32
**Usage**: Phosphorus-32 is utilized for the analysis of metabolic pathways.
**Decay Properties**:
- It has a rate constant for radioactive decay of \( k = 0.050 \, \text{day}^{-1} \).
---
### Problem Statements and Calculations
#### Part D
**Problem**: How much of a 1.04 mg sample of americium remains after 3 half-lives?
**Requirement**: Express your answer in milligrams to two significant figures.
**Solution Area**:
- Input box for the answer in milligrams.
- Submit button for answer evaluation.
#### Part E
**Problem**: How much of a 2.83 mg sample of phosphorus remains after 3 half-lives?
**Requirement**: Express your answer in milligrams to two significant figures.
**Solution Area**:
- Input box for the answer in milligrams.
- Submit button for answer evaluation.
#### Part F
**Problem**: How much of a 1.00 mg sample of americium remains after 4 days?
**Requirement**: Express your answer in milligrams to two significant figures.
**Solution Area**:
- Input box for the answer in milligrams.
- Submit button for answer evaluation.
---
Each section provides space for students to calculate the remaining amount of a radioactive sample based on its decay properties, stressing the importance of understanding first-order decay kinetics.
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