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The molecular weight of a compound can be determined by proton NMR. The NMR spectrum of an unknown compound revealed that the compound had a total of six hydrogen atoms. A solution was prepared that contained 1.50g of the unknown and 1.45g of 1,3,5-trinitrobenzene as a reference compound. The integration of the NMR spectrum for the mixture gave 421 area units for the 1,3,5-trinitrobenzene peak and a total of 1240 units for the unknown. Calculate the molecular weight of the unknown.
Name and provide the equations for four possible chemical reactions beginning with butane as the substrate (reactant). Use molecular formula and be sure your equations are balanced.
How many J of heat are necessary to raise the temperature of a 1.05-kg block of iron from 25.0 C to 88.5 C?
A buffer solution is prepared by mixing 50.0mL of 0.300 M NH3(aq) with 50.0mL of 0.300 M NH4Cl(aq). The pKb of NH3 is 4.74. NH3 + H20 ----> NH4+ + OH-
The value of the euro was recently $1.38 u.s. and the price of 1 liter of gasoline in france is 1.35 euro
What is the phase of the standard states of the following elements and compounds. (a) NH3 (b) Fe (c) N2 (d) Br2
A sample containing 1.5 moles of neon gas has a volume of 8.00 L. What is the new volume of the gas in liters when the following changes occur in the quantity of the gas at constant pressure and temperature.
will 500 mg of Na3C6H5O7 (258.1g/mol) or 500 mg of CaCO3 (100.1g/mol) neutralize more moles of hydronium ion? Assume that both the C6H5O7^(3-) and CO3^(2-) ions become fully protonated.
Write the balanced molecular equation for the combustion of methanethiol in an excess supply of oxygen.
although the use of absorbances at 450 nm provided you with maximum sensitivity the absorbaces at say 400 nm or 500 nm
When the reaction A--> B + C is studied, a plot of [A]t vs. time gives a straight line with a negative slope. What is the order of the reaction
The half-life for the reactant A in the first order reaction A ® B is 36.2 seconds. What is the rate constant for this reaction at the same temperature
what effect does the presence of sodium sulfite group on methyl orange have on the solubility of methyl orange in water. If this group were absent, would you expect the solubility of the resulting molecule to be more or less soluble in hexane than..
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