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The "colbalt treatments" used in medicine for arresting certain types of cancer rely upon the ability of gamma rays to destroy canercous tissues. Cobalt-60 decays with the emission of Beta particles and gamma rays, with a half life of 5.27 years. How much of a 4.78 microgram sample of Co-60 remains after 30 years?
1. 0.1098 micrograms remains after 30 years
2. 0.1067 micrograms remains after 30 years
3. 0.0925 micrograms remains after 30 years
4. 0.0832 micrograms remains after 30 years
5. 0.0667 micrograms remains after 30 years
Carbon tetrachloride (CCL4) is a useful solvent for both IR absorption and Raman Spectroscopy because it has few vibrational modes. The mostr intense Raman band occurs at 459.0 cm^-1.
the bond dissociation energy is the amount of energy required to break a bond? chose your answer from the followings? (a) homolytically (b) heterolytically (c) so as to produce the more stable pair of ions (d) via hydrogenation (e) none of the abov..
An experiment shows that a 247 mL gas sample has a mass of 0.432 g at a pressure of 747 mmHg and a temperature of 28 degrees celcius.What is the molar mass of the gas?
what mass of CH3CO2H is required to prepare 100.00ml of a 0.48M acetic acid solution?
in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction
Which of the following strong electrolytic solutions will have the highest electrical conductivity?
What mass of glucose (C6H12O6 ; 180.2 g/mol) is needed to prepare 2.25 L of a solution that has the same osmotic pressure as blood at 37 °C ? (R = 0.08206 L·atm/mol·K)
How many grams of dry NH4Cl need to be added to 2.10L of a 0.500 M solution of ammonia, , to prepare a buffer solution that has a of 8.84? Kb for ammonia is 1.8*10^-5.
An automobile tire is inflated with air originally at 10.0 celsius and normal atmospheric pressure. During the process, the air is compressed to 30.5% of its original volume and the temperature is increased to 45.5 celsius. (a) What is the tire pr..
If the specific heat of the ball bearing is .474 J/g times degress C, calculate the final temperature of the water. Assume the calorimeter to have neglible heat capacity.
A 3.00-l flask is filled with gaseous ammonia, . The gas pressure measured at 18.0 C is 1.55 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask?
Calculate the standard potential for this reaction. Normally, X is Fe. Here it is some unknown metal, allowing for somewhat random values for ΔGo.
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