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Using resonance structures, show why the NH2 group of aniline is an ortho/para director in electrophilic aromatic substitution
You need to produce a buffer solution that has a pH of 5.06. You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acet
Which of the following mixtures has the lower pH. A) Equal volumes of 0.10M HClO4 and 0.10M NaOH. B) Equal volumes of 0.10M HClO4 and 0.10M NH3.
The CaCl2 is purchased in the hydrated form. it contains one mole of water for each mole of compound, NaCO3 * H2O, and had a formula weight of 124.01 g/mol.
Write the reaction between Fe3+ and SCN- in which [Fe(SCN)3] forms. b) Determine the equilibrium expression for K associated with this reaction
To prepare 100 mL of a 0.500 M solution of this hydrated form requires 0.0500 moles of this salt. Calculate the grams of this compound that equals 0.0500 moles, showing all your calculations.
Use standard enthalpies of formation to determine ?Horxn for: 3NO2(g) + H2O(l) ? 2HNO3(aq) + NO(g) Enter in kJ. Find the change in internal energy for this reaction. Enter in kJ.
A 1.08 g sample of caffeine, C8H10N4O2, burns in a constant-volume calorimeter that has a heat capacity of 7.85 kJ/K. The temperature increases from 298.55 K to 303.37 K. What is the molar heat of
Solve an equilibrium problem (using an ice table) to calculate the pH of each solution. A solution that is 0.20 M in HCHO2 and 0.14M in NaCHO2
What percentage of the 131I released by the explosion would have remained by that time? Use the first order kinetic equation: [A] = [A]o e-kt
when 2-butanol undergoes E1 dehydration,three alkenes are obtained. Draw the sturctures for these alkenes.Which alkene would you predict to be formed in greatest abundance.
Choose the substance with the highest vapor pressure at a given temperature. sis2, bf3,rbcl, sbh3, ch3sch
The molar mass for NaCl and water are 58.443 g/mol and 18.015 g/mol, respectively. Calculate the partial molar volumes for NaCl and water in a 0.35m solution
Magnesium carbonate has a ksp value of 6.80×10?6 . What happens when magnesium and carbonate solutions are mixed to give 2.50×10?3 M Mg^2+ and 2.00×10?3 MCO3^2-
A certain weak acid, HA, is titrated with Ka 5.61x10^-6 naoh. More strong base is added until the equivalence point is reached. What is the pH of this solution at the equivalence point if the total
Use the H NMR spectrum of the purified cyclic acetal to identify the major diastereomer From borohydride reduction. There are no minor diastereomers. Draw its structure including stereochemistry. De
Does Gibbs energy of a gas at room temperature increase or decrease with increasing pressure and constant entropy
A solution is made by mixing 9.00 (millimoles) of HA and 3.00mmol of the strong base. What is the resulting pH
what effect does the presence of sodium sulfite group on methy orange have on the solubility of methyl orange in water. If this group were absent, would you expect the solubility of the resulting mo
Calculate the theoretical mass of solid formed. If the reaction in question 1 has 91.2%yield, calculate the actual mass of solid formed
Oxalic acid dehydrate, H2C2O4. 2H2O (formula weight = 126.1 g/mol) is sometimes used to standardize NaOH solutions. How many grams of this acid will be required to titrate 45.0 mL of 0.18 M NaOH sol
You already have a solution that contains 10 (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pKa of acetic
The following reaction is example of elimination and substitution reaction. Categorized this reaction as an E1, E2, or SN1, SN2 CH3CH2O¯ + CH3CH2Br ? CH3CH2OCH2CH3 + Br¯ Please, explain.
A certain weak acid HA, has a value of 9.7×10?7.Calculate the percent ionization of HA in a 0.10 m solution. Calculate the percent ionization of HA in a 0.010 m solution.
Draw (2R,3R)-2-bromo-3-phenylpentane in the conformation from which it is most likely to undergo E2 elimination to give 3-phenyl-2-pentene.