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1- Cobalt-57 has a half-life of about 272 days. If a sample has an initial mass of 2.24 grams and undergoes decay until it has a mass of 0.140 grams, how many half-lives have passed?
2- A sample of Thulium-171 has a mass of 0.4055 grams. How much is left after 6 half-lives?
3- Carbon-10 has a half-life of about 19 seconds. How many half-lives does it undergo in 2 minutes and 32 seconds?
4- A substance has a half-life of 5 years, how much of the initial sample remains after 15 years?
an automobile gasoline tank holds 21 kg of gasoline. When gasoline burs, 81 kg of oxygen is consumed and carbon dioxide and water are produced. What is the total combined mass of carbon dioxide and water that is produced?
M+ is added to a solution of 0.0035 M X- and 0.0016 M Z-. MX has Ksp = 8.2 × 10^-9, while MZ has Ksp = 1.7 × 10^-10. What percentage of the Z- is still in solution (not precipitated) when the MX just starts to precipitate? Answer in units of %.
the ratio of the no of molecules in the excited state at the temperature of 213 K to the number of ground state molecules and the percent of the excited molecules at 213 K.?
A solution is prepared by mixing 75.0 mL of 5.00 M HCl and 40.0 mL of 8.00 M HNO3. Water is then added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution.
The pressure in the eye of a hurricane is less than atmospheric pressure. Which one of the following pressure readings could not have been taken
a compound is 40% C, 6.7% H, and 53.3% O by mass. Assume that we have a 100 g sample of this compound. what are the subscripts in the empirical formula?
The DHfus of ethanol (C2H5OH) is 4.60 kJ/mol. How many kilojoules of heat are required to melt 24.5 g of ethanol at its freezing point.
A titration is performed in which 50.0 mL of 0.0463 M acetic acid (Ka = 1.8*10^-5) is titrated with 0.1000 M NaOH. Calculate the pH at the beginning of the titration
Use MO theory to predict the net bond order after N2 interacts with a photon that results in the promotion of an electron from bonding to an antibonding orbital.
What is the volume of .885 M hydrochloric acid required to react with (a) 25 mL of .288 M aqueous ammonia (b) 10 g of sodium hydroxide (c) 25 mL of a solution
A rectangular block of plastic, measuring 1.34 cm by 2.27 cm by 1.39 cm, floats in the middle of the Pacific Ocean. The volume of sea water displaced by the plastic block is 3.35 cm3. Assuming the density of the sea water is 1.025 g/mL, what is th..
Tell me if an induced current would exist, if you had a coil and a magnetic field that both were in motion at the same time.
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