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Suppose that the radioactive element Technetium (Tc, Z = 43) has three isotopes: 97Tc (21.72%, 97.03 amu), 98Tc (58.70%, 98.00 amu and 99Tc (98.92 amu). What is the atomic mass of Tc as it would appear in the periodic table? Do not enter units with your answer and use the correct number of significant figures.
how many grams of Lithopone will be produced in the reaction of 315 mL of 0.275 M ZnSO4 and 285 mL of 0.315 M BaS.
1. A corrosion technologist pipetted a 100.00 mL hard water sample and titrated it with 37.64 mL of 0.01 M EDTA solution for a total hardness endpoint, and 29.32 mL of 0.01 M EDTA solution for a calcium endpoint.
A vitamin C capsule is analyzed by tirating with 0.3M NaOH. It is found that 24.4 ml of base is required to react with a capsule weighing 0.55g.
The concentration of a 300 ML sample of CaCl_2_ solutionis .256M. What is the mass of the solute?
Copper is obtained from ores containing the minerals, azurite,Cu3(CO3)(OH)2, chalcocite, Cu2S, chalcopyrite CuFeS2
Why did the dialysis bag in the osmosis and dialysis experiment change
Which of the following substances, when dissolved in water, uses ion-dipole forces as the principal type of intermolecular attraction with water molecules. A) CH4 B) CH3OH C) CO2 D) KCl E) C6H6
What is the molar mass of the unknown gas? Express your answer to four significant figures and include the appropriate units.
an electron is confined to a linear region with a length of the same orderas the diameter of an atom (about 100 pm)
An auto mechanic spills 72 mL of 2.6 M H2SO4 solution from a rebuilt auto battery. How many milliliters of 1.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid?
phenol (respectively pKa 4.75 and 9.95), What is the principle species present at pH values 3, 5, 7, and 11?
The reaction A=B+ C is second order in A. when [A}0=0.100M, the reaction is 20% complete in 35 minutes. Calculate the value of the rate constant in ( L/min.mol)
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