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Lanthanum has two naturally occuring isotopes. 0.089% of lanthanum atoms are 138La and the rest are 139La. Estimate the average atomic mass of lanthanum, to the nearest tenth of an atomic mass unit.
determine the number and type of donor atoms in the ligand. Options include: a) 4 N and 2 O, b) 2 N and 2 O, c) 4 N and 4 O, d) 2 N and 4 O
A 125 lb patient is to receive a drug at a rate of 0.300 mg per 1.00 kg of body weight. If the drug is supplied as a solution containing 5.00 mg/mL, how many milliliters of drug solution should the patient receive
what concentration of Ba(OH)2 solution is left after complete precipitation of BaS. What is the mass of BaS Precipitated
Given that B(SiO) 640 kJ/mol, show that bond enthalpy considerations predict that silicon-oxygen compounds are likely to contain networks of tetrahedral with SiO single bonds
A particular method is to be used to analyze an ore that contains 4.8% copper. What minimum sample weight should be taken if the relative error due to a 0.5 mg loss is to be smaller than .1%
Determine what %by weight of sodium carbonate does it contain if the specific gravity of the silver nitrate solution = 1.25?
Using the same assumptions and approximations you used in lab, determine the molar enthalpy change (in kJ/mol) for the reaction below, assuming that CH3CO2H dissociates completely in water.
If a sample that is 1.200g in 25.0mL of heptane is cooled to 0 degrees C, what would be the percent recovery of the solid that would be collected? (M.P.=80 degrees C)
What Celsius temperature, T2, is required to change the volume of the gas sample in Part A (T1 = 41celsius, V1= 1770 L) to a volume of 3540 L ? Assume no change in pressure or the amount of gas in the balloon.
A bottle of wine consists of an 11 weight percent solution of ethanol (C2H5OH) in water. If the bottle of wine is chilled to -20oC, will the solution begin to freeze? Kfp for water is 01.86 oC?m-1
Explain what a high Ka value of an acid represents and what a low Ka value represents. State and explain the difference between the endpoint and the equivalence point in a titration
The pH of 0.5 M formic acic, HCOOH, is 2.02. Calculate the difference in pH when 6.42 g of HCOONa is added to 390.9 mL of 0.50 M formic acid. Ignore any changes in volume.
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