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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 & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions
Section: Chapter Questions
Problem 67GQ: The decomposition of gaseous dimethyl ether at ordinary pressures is first-order. Its half-life is...
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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.
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