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An extraction procedure specifies that an aqeuous solution containing dissoloved organic material be extracted twice with 10mL portions of diethyl ether. A student removes the lower layer after the first extraction and adds the second 10-mL portion of ether to the upper layer remaining in the separatory funnel. After shaking the funnel, the student ovserves only one liquid phase with no interface
What mass of oxygen gas, measured at STP, is required in order to release 8300 kJ of heat to the surroundings from the combustion reaction shown
The temperature increased by 10.08 oC. Use these data, plus the information given below for CO2 and H2O, to estimate the standard enthalpy of formation, of H, at 25 oC for this compound of H values at 25 oC for CO2(g) and H2O(l) are 394 kJ mol 1 a..
A solution is prepared by adding 50.0 ml of 0.050M HBr to 150.0 ml of 0.10M HI. Calculate the concentration of all species in this solution. HBr and HI are both considered strong acids.
Classify each of the following reactions into one of the four general categories: combination, deomposition, single displacement, or double displacement. a. H2SO4(aq) + 2 KOH(aq) --> K2SO4(aq) + 2 H2O(l)
Complete combustion of 3.90 g of a hydrocarbon produced 12.0 g of CO2 and 5.54 g of H2O. What is the empirical formula for the hydrocarbon?
if there are 45 drops of alcohol/mL, and the density of alcohol is 0.789g/mL. what is the blood alcohol concentration?
Which of the molecules N2, NO, O2, C2, F2, and CN would you expect to be stabilized by (a) the addition of an electron to form the anion (b) the removal of an electron to form the cation
In the following reaction, C2H5OH + 3O2 → 2CO2 + 3H2O, if 54 grams of water is produced, how many grams of C2H5OH is needed for the reaction.
a 1 kg sample of nitroglyceride c3h5n3o9 explodes and releasesgases with the temperature of 1985 celcius at 1 atm. what
Draw a mechanism for the dehydration of cyclohexanol catalyzed by phosphoric acid.
Multiple choice questions in organic chemistry - Which of the following statements are true about the processes of melting and freezing?
Calculate the energy change when one 235U nucleus undergoes the fission reaction 235U + n -> 142Ba + 92Kr + 2 n . The masses needed are 235U : 235.04 u; 142Ba : 141.92 u; 92Kr : 91.92 u; n : 1.0087 u.
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