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47Ca is radioactive and is used medically to detect bone tumors and other bone abnormalities. Its decomposition is first order with a rate constant of 0.1528/day. 47Ca to decompose? a. How long would it take for 85% of a sample of b. If 10.0 micrograms (ug) of 47Ca is needed for an experiment, mass that could be ordered if it takes 48 hours for it to arrive what is the minimum the supplier? from

47Ca is radioactive and is used medically to detect bone tumors and other bone abnormalities. Its decomposition is first order with a rate constant of 0.1528/day. 47Ca to decompose? a. How long would it take for 85% of a sample of b. If 10.0 micrograms (ug) of 47Ca is needed for an experiment, mass that could be ordered if it takes 48 hours for it to arrive what is the minimum the supplier? from

Chemistry
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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Hi I need help with these two questions 

47Ca is radioactive and is used medically to detect bone tumors and other bone abnormalities. Its decomposition is first order with a rate constant of 0.1528/day. a. How long would it take for 85% of a sample of 47Ca to decompose? b. If 10.0 micrograms (ug) of 47Ca is needed for an experiment, what is the minimum mass that could be ordered if it takes 48 hours for it to arrive from the supplier? The minerals magnetite (Fe302) and hematite (Fe2O3) exist in equilibrium with atmospheric oxygen. 4 Fe304 (s) + O2 (g) = 6 Fe2O3 (S) Kp = 2.5 × 1087 at 298 K a. Determine the partial pressure of oxygen at equilibrium for this reaction. b. The partial pressure of oxygen in air is 0.21 atm. In which direction will the reaction proceed to get to equilibrium? At room temperature, both magnetite and hematite are stable in air for a very, VERY long time. Using principles we have learned, why might this be so? C.
Transcribed Image Text:47Ca is radioactive and is used medically to detect bone tumors and other bone abnormalities. Its decomposition is first order with a rate constant of 0.1528/day. a. How long would it take for 85% of a sample of 47Ca to decompose? b. If 10.0 micrograms (ug) of 47Ca is needed for an experiment, what is the minimum mass that could be ordered if it takes 48 hours for it to arrive from the supplier? The minerals magnetite (Fe302) and hematite (Fe2O3) exist in equilibrium with atmospheric oxygen. 4 Fe304 (s) + O2 (g) = 6 Fe2O3 (S) Kp = 2.5 × 1087 at 298 K a. Determine the partial pressure of oxygen at equilibrium for this reaction. b. The partial pressure of oxygen in air is 0.21 atm. In which direction will the reaction proceed to get to equilibrium? At room temperature, both magnetite and hematite are stable in air for a very, VERY long time. Using principles we have learned, why might this be so? C.
Expert Solution
Step 1 Solution for part a

Intergrade rate law equation for first order nuclear reaction is 

ln [Nt]/[N0]  = -kt

[N0] = 100%

[Nt] = (100-85)  = 15%

 ln 15%/100% = -0.1528/day * t

t =12.42 days

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