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After getting a preliminary melting point range of 140-147 degrees C for an unknown, it is identified as o-nitrobenzoic acid. Running a mixed melting point determination with o-nitrobenzoic acid affords a melting point range of 126-138 degrees C. What does this say about the initial assumption concerning the identity of the unknown solid? Why did the melting point change so dramatically?
in the reaction p4 5 o2 rarr 2 p2o5 how many moles of o2 are consumed each time 0.5 moles of p2o5
What length of mirror drive in a Michelson interferometer is required to produce a resolution sufficient to separate a) infrared peaks at 500.6 and 500.4 cm-1
The observed rotation of a solution of 1.2 g of a compound in 10 mL of water is -6.9 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound
Given 0.1-M aqueous solutions of ammonium chloride (NH4Cl) and ammonia (NH3) to the so- lution of that weak base. Calculate the volumes of salt and ammonia to be mixed, in order to make 50 mL of a buffer solution with pH = 9.0. The ammonium ion (N..
How do I make a stripping buffer that is 20 mM sodium phosphate, 500 mM NaCl and 50 mM EDTA
Question- Propose a structure for the solid that separates when concentrated sulfuric acid is added to the solution of p-aminobenzoic acid in ethanol.
Write an equation for the reaction of n-butyl alcohol with acetyl chloride. What gas evolved
A layer of peat beneath the glacial sediments of the last ice age has a carbon-14/carbon-12 ratio that is 21.4% of that found in living organisms. How long ago was this ice age
Calculate the freezing point (in degrees C) of a solution made by dissolving 5.89 g of fructose (C6H12O6) in 37.5 g of water. The Kfp of the solvent is 1.86 K/m and the normal freezing point is 273 K.
How many moles of CF4 can be produced when 5.00 mol C react with 8.00 mol F2?
Identify the species that is oxidized and species that is reduced in the two following reactions: Reaction 1: IO3- + 8I- + 6H+ -->
Limestone (CaCO3) emits CO2 gas when exposed to HCl. Explain what is the theoretical yield of CO2 if 56.1 grams of limestone is entirely dissolved in HCl? CaCO3(s) + 2 HCl(aq)? CaCl2(aq) + CO2(g) + H2O(l)
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