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Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in Appendix 3. (?H°f (HgO(s)) = -90.7 kJ/mol and ?H°f (FeO(s)) = -272 kJ/mol.)
(a) 2 Hg(l) + O2(g) 2 HgO(s)
(b) C2H5OH(l) + 3 O2(g) 2 CO2(g) + 3 H2O(l)
Sometimes the structure of phosphoric acid is written with single bonds to both the OH groups and to the oxygen atom; other times the bond between the P and the O is shown as a double bond. The "truth" probably lies somewhere between. Explain
The density of an unknown metal is 8.94 g/cm^3 and its atomic radius is 0.126 nm. It has a face-centered cubic lattice.Find the atomic weight of this metal.
The electron in a hydrogen atom occupies a 6p orbital. What is the longest wavelength of light that can be emitted by this atom? Give answer in nanometres, nm
A 12-liter tank contains helium gas pressurized to 160atm . What size tank would be needed to contain this same amount of helium at atmospheric pressure (1atm )?
Calculate the rotational partition function of CH4 (a) by direct summation of the energy levels at 298K and 500K, and (b) by the high temperature approximation. Take B= 5.2412 cm^-1
Compaire soltuions 2 and 4. how does the common-ion effect influence the ph of solution 4? explain fully, and calculate the expected ph of each of these soltuions.
The normal boiling point of bromine is 58.8 C. Given that the vapor pressure pressure of bromine is 75.0 torr at 2.5 C, Calculate the molar enthalpy of vaporization of bromine.
For the reaction 2Na(s) + Cl2(g) -> 2NaCl(g), how many grams of NaCl could be produced from 103.0g molecules of Na and 13.0 of Cl2 (at STP)?
Add 1mg of alcohol dehydrogenase. Assuming all of the ethanol is converted to acetaldehyde, what will the final concentration of NADH be in the solution
a weather balloon has a volume of 750 l when filled with helium at 8 oc at a pressure of 380 torr. what is the new
A solution is known to be 23 percent by volume rubbing alcohol (isporpanol). How many mililiters of isopropanol would be in 250 mL of solution. 25 percent
Calculate the molar mass of a vapor that has a density of 1.88 g/L at 25.2 oC and 710. mmHg.
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