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A patient is given 0.055mg of technetium -99m, a radioactive isotope with a half-life of about 6.0 hours.
Part A:
How long does it take for the radioactive isotope to decay to 3.1 x 10^-3 mg? (Assume no excretion of the nuclide from the body)
The isotope 172Ta undergoes decay by positron emission. After 2 hours , 1/6 of the initial amount of 172Ta remains undecayed. The half- life of the isotope is
1000g of Na2HPO4 is dissolved in 100mL of water. using mass balance and charge balance deterimne the pH of the resulting.
The buffer has a concentration of 150 mMol ( 150 mM of KH2PO4 / 150 mM K2HPO4. The pKa of the drug ephedrine is 9.6. Will the drug have a negative, positive, or neutral?
Its volume in the liquid state is 1.00 cm3 and its volume in the vapour state is 1671 cm3. Find the work done by expansion due to evaporation and the change of internal energy of the system.
A 2.63 L flask is filled with carbon monoxide at 27°c until the pressure is 6.72 ATM. Calculate the total pressure after 2.89 moles of carbon dioxide has been added to the flask.
A chemical process is designed to produce ethylene from ethane according to the reaction: C2H6 (ethane) ? C2H4 (ethylene) + H2 The fresh feed to the process contains pure ethane at a flowrate of 100 mole/min. The fresh feed is mixed with a recycl..
How many moles of hydrogen gas are produced when 0.066 mole of sodium is completely reacted?
Pure solid NaH2PO4 is dissolved in distilled water, making 100.0ml of solution. 10 ml of this solution is diluted to 100.00 ml to prepare the orignal phosphare standard solution
Explain why a buffer made of equal concentrations of CH3COOH and CH3COO- does not change in pH when a small amount of NaOH (a strong base) is added to the solution. Does the NaOH dissociate into ions when it is added to the solution?
If a random sample of this element collected from the tail of a comet has an weighted average atomic mass of 10.788 amu, what is the percent abundance of the lower-mass isotope?
Using the half-reaction method, balance the following oxidation-reduction reaction which occurs in acidic solution. Be sure to show the each step in balancing both half-reactions
Write the complete electron configuration of lead (not the simplified condensed notation using the enarest inert gas)
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