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When a 7.82-g sample of solid potassium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 22.7 °C to 59.2 °C. What is ÎH for the dissolution of KOH in water, as shown below?
KOH(s) K+(aq) + OH(aq)
Assume that all solutions have the same specific heat as water.
119 kJ/mol
1.19 x 103 kJ/mol
16.5 kJ/mol
Aluminum hydroxide reacts with sulfuric acid as follows: 2 Al(OH)3 (s) + 3H2SO4 (aq) rightarrow Al2(SO4)3 (aq) + 6H2O (l) Which reagent is the limiting reactant when 0.700mol Al(OH)3 and 0.700mol H2SO4 are allowed to react?
Mesitylene is a compound consisting only of C and H. If you burn 0.115 g of the compound, and find that it produces 0.379 g of CO2 and 0.1035 g of H2O.
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Question- If a magnetic field strength of 4.7 T requires radio frequency of 200 MHz to achieve resonance with the nuclei (i.e. for the spin flips to occur), would a 300 MHz radio frequency NMR instrument need a magnetic field higher or lower than ..
if junipers were allowed to grow in a medium containing acetate in which the methyl carbon was labeled with 14C
Explain a non-reducing sugar found in honey has the molecular formula C18H32O16. Acidic hydrolysis gives 1 mole D-fuctose, 1 mole. Compute the total number of stereoisomers possible for this trisaccharide
Ethene C2H4 can be halogenatd by the following rxn: C2H4+X2=C2H4X2 where X2 can be Cl2, Br2 A) Use the thermodynamic data given to calculate Delta H for the halogenation reaction by Br2 at 31degree celcius.
2-bromo-3-methylbutane reacts with potassium iodide in methanol to yield 2-iodo-2-methylbutane. 2-bromo-3-methylbutane
Write an equation for the reaction of 2-furaldehyde with 1,3-dihydroxybenzene to form its product and propose a mechanism for it's formation.
How many milliliters of 5.00 M HCl solution are needed to provide the 1.50 moles of HCl needed for a reaction?
In the laboratory you dissolve 15.3 g of copper(II) iodide in a volumetric flask and add water to a total volume of 500 mL. What is the molarity of the solution
To demonstrate the first order behavior of the reaction and determining the rate constant, the graphical plot of the quantity ----- on the Y-axis vs. time (t) produced a straight line. What was the quantity that plotted on the y-axis
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