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The molecule H2S2 has a linear arrangement of its atoms. Number all sulfur atoms along the chain from 1 to 4. Find the oxidation number of each sulphur in the molecule from the first to the fourth.
the air feels cool because heat is required to evaporate the water from our skin. How much heat is required to evaporate 20.6 g of water? The enthalpy of vaporization of water is 44.0 kJ/mol.
Write a chemical equation for the reaction corresponding to the standard enthalpy of formation of N2O5 (g) and determine its value from the following thermochemical data
A gas mixture composed of helium and argon has a density of 0.670 g/L at 755 mm Hg and 298K. What is the composition of the mixture by mass
To determine the volume of a gas using ideal gas law and evaluate the number of moles of a gas using ideal gas law.
Write the balanced net ionic equations for the reactions that occur in each of the given cases as. Cr2(SO4)3(aq) + 3(NH4)2CO3 (aq) = Cr2(CO3)3 ( s) + 3(NH4)2SO4 ( aq).
Derive an expression for the elution time of charged solute undergoing electrophoresis in a CE unit with capillary length L. Remember that the electric field can be expressed as voltage per length.
Explain how Le Chatelier's Principle affects the extent of the dissociation of acetic acid in a buffer that is 0.10 M acetic acid and 0.10 M acetate ion
c2h6g o2g co2g h2oga consider the unbalanced equation above. how many grams of o2 are required to react with 13.0 g
The absorbance maxima observed for the following cobalt complexes ([Co(NH3)6]3+ ?max = 470 nm, [Co(NH3)5Cl]2+ ?max = 560nm, [Co(NH3)4Cl2]+ ?max = 630 nm, and [Co(NH3)3Cl3] ?max = 680 nm) can be identified with transitions involving d-electrons. a)..
Which alkene is more stable, the E or Z isomer above. why does irradiation go from E to Z rather than the other way around. how will the Rf values from TLC compare
When sodium sulfate, Na2(SO4), is dissolved in water, the temperature goes down. How would you describe the energetics of this process?
Determine the molar solubility of CuCl in a solution containing 0.050 M KCl. Ksp (CuCl) = 1.0 × 10-6. Answer A. 1.0 × 10-12 M B. 5.0 × 10-7 M C. 2.0 × 10-5 M D. 1.0 × 10-3 M E. 0.050 M
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