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How long does it take for the radioactive isotope to decay to 4.9×10?3 mg? (Assume no excretion of the nuclide from the body.)
You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400 counts. has diminished to 100. counts after 35.2 minutes ,
What is the maximum work you can obtain from 16.0 g of nickel in the following cell when the emf is 0.89 V? Ni(s) | Ni2+(aq) || Ag+(aq) | Ag(s)
You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 35.2 minutes,
A solution of 75.0 of benzene and 75.0 of toluene has a total vapor pressure of 80.9 at 303 . Another solution of 100.0 benzene and 50.0 toluene has a total vapor pressure of 93.9 at this temperatur
A solution is prepared by dissolving 20.2 of methanol in 100.0 of water at 25 . The final volume of the solution is 118 . The densities of methanol and water at this temperature are 0.782 and 1.00 ,
At least how many standard solutions would you need to make calibration graph, assuming that the graph is expected to be a straight line? Explain your answer. Do not include the data from distilled
The density of the unknown solution is 1.232g/mL. Calculate the specific gravity of the solution.
How many grams of sucralose would you need for a solution that has the same sweetness as one made with 2.00g of sugar? Please show how to solve problem
Calculate the concentration of sugar in % (w/v) for a 250mL solution that contains 4.32g of sugar
(1) write the electron configuration of Co (III) (2) what is the geometry structure of this complex ion? Linear, Tetrahedral, Square planar or Octahedral. (3) predict the number of unpaired electron
Decide whether or not each of the following metals dissolves in 1 {\rm M} {\rm{HNO}}_3. For those metals that do dissolve, write a balanced redox reaction showing what happens when the metal dissolv
How to tell if a compound is polar or non-polar when looking at its structure? Please answer in simple words rather than a whole bunch of scientific terms.
Use the angular overlap method to calculate the energies of both ligand and metal orbitals for trans {Cr(NH3)4Cl2}+, taking into account that ammonia is a strong sigma donor ligand than chloride , b
How many moles of oxygen are consumed when 100. L of dinitrogen pentoxide are produced in the following equation 2 N2 + 5 O2 ---> 2 N2O5
Which of the following changes to a voltaic cell would cause an increase in potential (i.e., more positive Ecell)
Assume the temperature of the mixture is chosen so that Kp=0.12. Predict the effect on the partial pressure of SO3 as equilibrium is achieved by using Q, the reaction quotient.
a) how many moles of sulfur are in 23.2 g of (C3H5)2S, b) how many atoms of hydrogen are in 0.75 mol of (C3H5)2S, c) how many grams of carbon are in 4.20 x 10^23 molecules of (C3H5)2S, d) how many a
The ore is dissolved in hot, concentrated acid and passed over a reducing agent so that all the antimony is in the form Sb3 (aq). The Sb3 (aq) is completely oxidized by an aqueous solution of BrO3-(
Calculate the maximum work available from 57.0 g of aluminum in the following cell when the cell potential is 1.15 V. Note that O2 is reduced to H2O. Al(s) | Al3+(aq) || H+(aq) | O2(g) | Pt
Calculate the number of moles in each of the following: a) 85.2 g of Ni, b) 144 g of K, c) 6.4 g of H2O, d) 308 g of BaSO4, e) 252.8 g of fructose C6H12O6
what is the mass in grams in 2.28 mol of each of the following: a) N2, b)SO3, c)C3H6O3, d)Mg(HCO3)2, e)SF6. Please use significant figures.
A particular voltaic cell operates on the reaction below, giving an emf of 0.865 V. Calculate the maximum electrical work generated when 20.0 g of zinc metal is consumed. Zn(s) + CI2(g) ? Zn2+(aq) +
What is the mass in grams for each of the following: a) 5.12 mol of Al, b) .75 mol of Cu, c) 3.52 mol of MgBr2, d) 0.145l of C2H6O, e) 2.08 mol of (NH4)2SO4.
1In a hydrogen fuel cell, hydrogen gas and oxygen gas are combined to form water. Write the balanced chemical equation describing this reaction (using lowest whole-number coefficients).