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In metallic magnesium what fraction of the molecular orbits restricted in the valence band plus the conduction band are in use by electrons? Explain
what is the effect of a temperature change on a chemical reaction initially at equilibrium? how does the effect differ
One mole of He is heated from 200 degree C to 400 degree C at a constant presure of 1 atm . Given that absolute entropy of He at 200 degree C is 810 J/K/mole and assuming He is a perfect gas
Which solution should be the most acidic? 1) Zn(NO3)2(aq) 2) Cd(NO3)2(aq) 3) Ga(NO3)3 (aq) 4) Hg(NO3)2(aq) 5) Al(NO3)3(aq)
When 23.2 mL of 0.11 M HCl are added to 50.0 mL of a 0.17 M solution of a weak monoprotic base, the pH of the solution is 9.70. What is the Kb of the weak base
At the begining of the titration being performed in this lab experiement, how do you determine how much naoh should be added at each interval between volume-pH readings? As you approach the equivalence point,
The lighter isotope has an abundance of 67.7%. Calculate the atomic mass of the element X.
The temperature of water decreases on the dissolution of NH4NO3. From this observation, we can conclude that the solution process would be best described as
Calculate the grams of sloute required to perpare 750ml of a 7.5 x10-3 M from NiSO46H2O.
The explosive, TNT, is composed of 37.0% carbon, 2.2% hydrogen, 18.5% nitrogen and the rest oxygen. if the molar mass of TNT is 227 g/mol, what is the empirical and molecular formula for TNT?
A proton in a linear accelerator has a de Broglie wavelength of 139 pm what is the speed of the proton?
A 0.1236-g sample of an unknown monoprotic acid was dissolved in 25.8 mL of water and titrated with 0.0680 M NaOH solution. The volume of base required to bring the solution to the equivalence point was 19.1 mL.
How many grams are present in 1 gram of potassium-40. Its natural abundance is 0.0117% and its half life is 1.28X10^9 yrs
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