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A method of preparing a very pure alkane is to react the corresponding alkyl magnesium halid (grignard reagent) with water and collect the alkane product. Often a chemist has the problem of determining structural characteristics of an unknown pure substance. In an analytical procedure known as the Zerewittenoff process the number of moles of active hydrogen in an unknown compound is determined by reatment of the unknown compound with methyl magneium bromide and measurement of the volume of methane evolved. An active hydroge is defined as one that will react with the Grignard reagent. Usually it is a hydrogen bonded to oxygen, nitrogen, sulfur, phosphorous and only occasionaly to carbon.
A sample of 1.83mg of an unknown compound of molecular weight about 92 amu gave 1.34mL of methane gas (corrected to STP) when reacted with an excess of methyl magnesium bromide. How many active (that is acidic) hydrogens are there per molecule? Assuming all the active hydrogens to be -OH groups, suggest a structure for the unknown compound.
Would a solution that has a molarity of 0.990 M KNO3 and a density of 0.988 g/mL be considered unsaturated, saturated, or supersaturated?
If 8.6 L of H2 reacted with 4.3L of O2 at STP, what is the volume of the gaseous water collected (assuming that none of it condenses)? 2H2(g) + O2(g) -> 2H2O(g)
Write the equation for a nonspontaneous reduction-oxidation reaction involving the transfer
Determine the minimum mass of Sodium bicarbonate or sodium hydrogen carbonate that should be added to the spill to neutralize it?
Calculate the molarity of a solution made by adding 21.7 mL of concentrated potassium hydroxide (34.5 % by mass, density 1.46 g/mL) to some water in a volumetric flask
Calculating percent purity from a reaction, One of the reactions that occurs in a blast furnace, where iron ore is converted to cast iron is Fe2O3 + CO = Fe + CO2.
use maxwell distribution of speeds to estimate the fraction of CO2 molecules at 300K that have speeds in the range 200 to 250 m/s.
N2 + 3H2 --> 2NH3 what volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia?
What are the equilibrium partial pressures? Nitrogen dioxide decomposes according to the reaction given below where Kp = 4.48 x10^-13
What volume of ammonia could be made from the reaction of 2.5 liters of nitrogen (N2) and 8.5 liters of hydrogen (H2) at STP?
The natural abundance of 107 Ag is 51.84%. How many 107 Ag atoms are present in a piece of silver weighing 150 mg?
explain in molecular terms, whether evaporation rate of a liquid is constant or varied in the presence of changing ambient air pressure.
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