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What is the boiling point of a mixture composed of 95.0 g HOCH2CH2OH (ethylene glycol) and 205g H2O? The boiling point elevation constant for H2O is 0.512 °C/m
"A mixture of CH4 and H2O is passed over a nickel catalyst at 100 degrees K. The emerging gas is collected in a 5.00-L flask is found to contain 8.62g of CO, 2.60 g of h2, 43.0 g of CH4, and 48.4 g of H2O.
Briefly draw a procedure you could use to determine the HC2H3O2 concentration in a vinegar sample. Explain what would be the pH at the equivalence on the titration
Trace amounts of rare elements are found within groundwater and are of interest to geochemists. Europium and terbium are lanthanide-series elements that can be measured from the intensity of their fluorescence emitted when a solution is illuminate..
the world's estimated annual gas reserves in 2006 were 6124 trillion ft3 .The world rate of annual use was 105.5 trillion feet3. How long these reserves will last if the rate of use continues?
The mass of an electron is 9.11\times 10^{-31}~\rm kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31\times 10^{-10}~\rm m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00\times10..
Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ?Hº for the reaction written below, using the bond energies given.
Which substance contains molecules that will not form hydrogen bonds?
A technician plates a bowl with about 4.6 grams of chromium from an aqueous chromium (III) sulfate. What current is needed to plate this amount of chromium in 3.5 hours.
Phosphate buffer is a commonly used buffer for biological experiments. The buffer is made by combining H2PO4- (pKa = 7.21) and HPO42-.
A reaction that is used to propel rockets is N2O4(l) + 2N2H4(l) --> 3N2(g) + 4H2O(g). This reaction has the advantage that neither product is toxic, so no dangerous pollution is released.
A 110.0 mL sample of a solution that is 3.0×10^?3 M in AgNO3 is mixed with a 220.0 mL sample of a solution that is 0.13 M in NaCN. After the solution reaches equilibrium, what concentration of Ag+(aq) remains
A mixture was found to contain 3.10g of SiO2, 0.38 g of cellulose and 6.72 g of calcium carbonate. What is the percentage of SiO2 in this mixture
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