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Iodine-131 is a radioactive isotope. After 5.00 days, 65.0% of a sample of 131I remains. What is the half-life of 131I? please show all details on how you got the answer im really trying to understand this
when the zinc coating on an iron can is scratched, rust does not form. use the activity series to explain why this happens.
The temperature is increased to 45 degree celcius then determine what is the pressure in the cylinder
A sample of nitrogen gas in a 4.4-L container at a temperature of 35°C exerts a pressure of 3.7 atm. Calculate the number of moles of gas in the sample.
If you wanted to prepare a 1.45 L buffer with a total phosphate concentration of 0.0500 M, how many grams of NaH2PO4 and Na2HPO4 would you mix together? How many grams of conjugate acid do you need? How many grams of conjugate base do you need?
What is the energy change when the temperature of 14.4 grams of liquid mercury is decreased from 37.9 C to 24.4 C
a sample of He gas has a volume of 900 mL and a pressure 2.50 atm at 298 K. What is the new pressure when the temperature is changed to 336 K and the volume is decreased to 450 mL?
One reason you do this is to help minimize the potential side reaction that forms byphenyl. How does the additional 30 mL of anhydrous diethyl ether minimize the formation of the biphenyl side product?
What is the pH at the equivalence point of the titration and at the half equivalence point
Calculate the amount of heat liberated when 4.80 g CH4 reacts with an excess of oxygen.
Titrate 80ml of NH3 w/35ml of 0.30M HCl. Find pH and select an indicator beside bromocresol green that can be used.
A 21.70mL volume of 0.0940 M NaOH is required to reach the phenolphthalein endpoint in the titration of a 3.06g sample of vinegar. calculate the number of moles of acetic acid in the vinegar sample.
A mixture of gases conssists of CH4 at a partial pressure of 143 mm Hg, N2 at a partial pressure of 469 mm Hg, and O2 at a partial pressure of 563 mm Hg
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