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Problem: The density of lead is known to be 11.34 g:cm. A student obtains a piece of lead. He records the mass as 45.89g. He finds the volume to be 4.20cm3. Calculate the density according to the student's data. Please answer the following question.
Calculate the lattice energy of Na2O for the following data: Ionization energy of Na(g):::495kj/mol, Electron affenity of O(g) for 2e-:::603 kj/mol
Problem- A wooden boat discovered just south of the Great Pyramid in Egypt has a carbon-14/carbon-12 ratio that is 71.5% of that found in living organisms
What are the advantages to having DNA, RNA and protein compared to only RNA?
A 2.60-L vessel contained 0.0160 mol of phosphorus trichloride, 0.0115 mol of phosphorus pentachloride, and 0.0903 mol of chlorine at 180°C in an equilibrium mixture. Calculate the value of Kc for the following reaction. PCl3(g) + Cl2(g) PCl5(g)
The following reaction occurs in basic solutions. What is the sum of the coefficients in the balanced equation. MnO4- + NH3 ----> NO3- + MnO2
A studet determined the percentage KHP in an impure sample of KHP . a 3.150g sample of impure KHP required 41.50 mL of 0.1352M NaOH solution for titration.1) calculate the number of moles of NaOH required for this titration
Calculate delta H for this reaction at 298K. Calculate delta G for this reaction at 298K. Calculate delta S for the reaction, for the surroundings, and the total delta S.
sodium metal requires a photon with a minimum energy of 4.41 x 10-19 j to emit electrons.a what is the minimum
Chemists have discovered nearly 300 different anthocyanins. Finish drawing a resonance contributor in Box 3 that shows positive charge on one of the other oxygens in this anthocyanin. It is not necessary to draw any electron flow arrows in your re..
which statement best describes the attraction present in metallic bonding?a.the attraction between nuclei and
Rank the subsequent gases in order of their speed of diffusion through a membrane, and Compute the ratio of their diffusion rates: HCL, F2, Ar
A mixture of NaCl and NaBr has a mass of 2.10 g and is found to contain 0.75 g of Na. What is the mass of NaBr in the mixture?
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