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The activity of a sample of Ba-137m has reduced by 75% from its initial activity after 5.10 minutes. Explain what is the half-life of Ba-137m? Define what fraction of activity remains after 6.25 minutes? (A=Aoe (-kt); k = .693/t1/2)
solution of sodium chloride contains 5.2 g nacl in 900 grams of water. what is the concentration of the solution in
A steel railroad bridge uses a zinc sacrificial anode to limit the extent of oxidation of the steel. If a 5.1 kg anode is completely ozidized to Zn2+ over the course of 15.5 years, compute the average current flowing through the anode.
The radius of a gold atom is 144 pm. How many gold atoms would have to be laid side by side to span a distance of 2.63 mm?
What is the vapor pressure of SiCl4 (in mm Hg) at 23.5 C? The vapor pressure of SiCl4 is 100 mm Hg at 5.4 C and Delta H vap
How much heat energy is required to convert a 1.00 L block of ice at -40.00 degrees Celsius to steam at 250.0 degrees Celsius?
hydrazoic acid (HN3, Ka = 1.900x10-5) with 0.08699 M KOH, what is the pH after 92.88 mLs of titrant have been added
how many grams of potassium sulfate are required to make 385 ml of 2.5M solution
what would be the ratio of the C-14 concentration in the innermost (oldest) ring compared with that in the outermost
A 50.0 L steel vessel, filled with CH4 to a pressure of 10.0 atm at 298 K, is heated to 1600 K to convert CH4 into C2H2 . What mass of C2H2can be produced. What pressure does the reactor reach at 1600 K? 2CH4 (g) C2H2(g) + 3H2(g)
Sample containing three organic compounds: a hydrocarbon (RH), carboxylic acid (RCOOH), and an amine (RNH2, organic compound with acid-base properties similar tammonia).
HCLO is a weak acid (Ka=4.0x10-8) and thus the salt NaCLO acts as a weak base. Explain what is the pH of a solution that is .019 M in NaCLO
what volume of dry hudrogen would be produced understandard conditions when 0.250 g of magnesium reacts withexcess
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