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Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.21% abundance), X-29 (28.976 amu, 4.70% abundance), and X-30 (29.974 amu, 3.09% abundance). Calculate the atomic weight of X.
Some aromatic compounds also undergo nucleophilic substitution, propose a mechanism for this reaction and indicate what types of substituents would be expected to be most reactive
Calculate the transmittance of 162-nm radiation through a sample of ethylene gas at 25 oC and 10 torr for a cell length of (a) 1.0 cm; (b) 10 cm.
A solution of an unknown nonvolatile electrolyte was prepared by dissolving 0.250 g of a substance in 40 g of CCl4. The boiling point of the resultant solution was 0.357 degrees Celsius higher than that of pure solvent. Calculate the molar mass of..
The mass spectrum of an organic compound shows the relative abundances of M to be 58.09% and M 1 to be 15.08%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound
the two amino acids, glycine and alanine, can form two different dipeptides. Draw one of the possible dipeptides as it would appear at a pH of 7. Be sure to include any necessary nonzero formal charges in your drawing
How much energy (heat) is released when 1.9 moles of H2 reacts with 0.7 moles of Cl2 to create HCl(g) if the ΔHrxn = -184.6 kJ.
Use the values from the table of reduction potentials on the last page to determine ?Gº and Keq for the reaction as listed below. Pb (s) + Sn2+ (aq) ? Pb2+ (aq) + Sn (s) ?Gº
Suppose a bone from an ancient human contains 17.5% of the {rm C}-14 found in living organisms. How old is the bone?
When determining the number of milliliters of mercuring with the density of 13.6 g/mL and having a mass of 501 g, do you divide 13.6 by 501?
At some temperature, a chemist found the following equilibrium concentrations. [Fe3+] = 6.63 10-3 M, [SCN-] = 7.36 10-3 M, [FeSCN2+] = 4.34 10-2 M
If the molar enthalpy of combustion of ethane is -1.56 MJ/mol, how much heat is produced in the burning of;
A student used 22.0 mL of 0.1035 M NaOH to titrate 20 mL of orange juice. How many grams of citric acid were present in the sample? The molar mass of citric acid, H3C6H5O7, is 192.12 g/mol. H3C6H5O7(aq) + 3NaOH(aq) Na3C6H5O7(aq) + 3H2O(l)
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