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For the reaction {\rm CH_4(g) + 4F_2(g) \rightleftharpoons CF_4(g)+4HF(g)},~~~~~~\Delta H^\circ =-1679.5~\rm kJ we can see that the amount of heat released is 1679.5 \rm kJ per mole of methane, or 1679.5 \rm kJ per four moles of fluorine. How much heat is released per mole of fluorine?
Methanol is toxic for humans if they ingest liquid methanol or inhale methanol vapor in significant quantities. When inhaled in concentration greater than 1000 ppm, death has been reported.
Given that the Ka of boric acid is 5.8x10^-10M, what is the pH of a 0.50M boric acid solution? Are there any good approximation available?
Calculate the percent composition of copper in the hydrate CuSO4.5H2O based on atomic weight data.
how many sigma bonds and pi bonds, respectively, can be formed by a carbon atom that is sp hybridized
Assuming that the gas becomes saturated with benzene vapor and that the total gas volume and temperature remain constant, what is the vapor pressure of the benzene in torr
Each of four compounds shown has one signal in the aromatic region and one signal in the alkyl region of its H NMR spectrum. Use the integral values to determine which compound's H NMR spectrum is shown below
Calculate Ka for hydrogen peroxide. you may use the reactions given on the data sheet, Kw=1.0x10^-14. Assume that hydrogen peroxide is a monoprotic acid.
The protein in a 1.285-g sample of an oat cereal is determined by the Kjeldahl procedure for organic nitrogen. The sample is digested with H2SO4, the resulting solution made basic with NaOH
Lakes that have been acidified by acid rain (HNO3 and H2SO4) can be neutralized by a process called liming, in which limestone (CaCO3) is added to the acidified water. What mass of limestone (in Kg) would completely neutralize a 15.5 billion-liter..
The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?
What mass of aluminum can be formed by the passage of 215C through an electrolytic cell containing a molten aluminum salt.
In the concentration range of 500 to 2000 ppm of U, there is a linear relationship between absorbance at 351.5 nm and concentration. At lower concentrations the relationship is nonlinear unless about 2000 ppm of an alkali metal salt is introduced ..
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