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A 1.00-kg block of copper at 20.0°C is dropped into a large vessel of liquid nitrogen at 77.3 K. How many kilograms of nitrogen boil away by the time the copper reaches 77.3 K? (The specific heat of copper is 0.092 0 cal/g·°C. The latent heat of vaporization of nitrogen is 48.0 cal/g.)
Each of the following compounds exhibits a single 1H NMR peak. Approximately where would you expect each compound to absorb? a. cyclohexane b. acetone c. benzene d. glyoxal (ethandial) e. dichloromethane f. trimethylamine ((CH3)3N)
Denoting the initial, unknown concentration CD2+, write an equation to calculate the final concentration , CD2+ considering the dilution factor, units are ppm.
A white solid, soluble in water and alcohol but not in toluene, does not melt when heated to 250°C. However, upon prolonged heating of the solid a colorless gas evolves and the amount of solid "shrinks". The solid appears in the list of pure subst..
what is the ph of a solution prepared by mixing 50.0ml of 0.125M KOH and 50.0 ml of 0.125M HCl
Dye 2 failed to quench the synthesis of benzpinacol however afforded a red flurorescence in the chemiluminescent reaction. Explain what can say about the approximate energy levels of the S1 and T1 states of the two dyes
burning 0.115g of the compound in oxygen gives 0.379g of CO2 and 0.1035g of H2O. what is the empitical formula of mesitylene.
If the wave functions describing the 2s and two of the 2p orbitals are combined, the identical orbitals form bond angles of what degree?
write the molecular formula for given compounds and determine the amount of molecules present.for each of the following
Characterize each of the following as a strong, weak, or non-electrolyte: a. H2O, b.HCl, c.HNO3, d.KCl, e.KNO3, f.KOH, g.CH3CO2H, h.CUSO4, i.NH3, j.Ca(NO3)2,k. Al(NO3)3
in bombarding atomic nuclei with proton bullets why must the protons be accelerated to high energies if they are to
Presume that we have a mixture of N2 (g) and O2 (g) of unknown composition whose total pressure is 385torr. If all the oxygen as is removed from the mixture by reaction with phosphorus, which doesn't react directly with nitrogen then the new press..
You have a 50.00mL sample of .287 M alanine. What will be the pH of the solution be after it is titrated with 39.14 mL of .550 M NaOH
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