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When performing a Friedel-Crafts alkylation reaction, not only does one have the problems of multiple alkylation and rearrangement of the cation, but the presence of strong electron donating groups
0.40 moles of a diprotic acid, H2A, is dissolved in 250 mL of water. The Ka1 of this acid is 1.0 x 10E-5 and Ka2 is 1.0 x 10E-9. What is the concentration of the di-anion, [A^2-], in this solution (
A 10 mL sample of an unknown aqueous nickel 2 solution was treated and found to produce 0.0532g of Ni(DMG)2 precipitate. Calculate the percent Nickel in the ore sample.
What is the pH at the equivalence point when 100 ml of 0.15 M hydrofluoric acid HF is titrated with 0.5 M sodium hydroxide NaOH at 298K? (Ka(HF) = 7.2 x 10-4 )
Give the answer in cubic meters. how many grams of oxygen do we breathe in each day if air is 20.5% oxygen and the density of oxygen is 1.43 g/dm^3?
We will titrate 50.0mL of 0.200M NH3(aq) ( pKb = 4.76) with 0.200M HCl(aq). What is the initial pH of 50.0mL of 0.200M NH3(aq) before HCl is added.
A mixture of ethanol and 1-propanol behaves ideally at 36C and is in equilibrium with its vapor. if the mole fraction of ethanol in the solution is 0.67. calculate its mole fraction in the vapor ph
What is the pH at the stoichiometric point (end point) for the titration of 50 ml of 0.20 M methyl amine CH3NH2 (aq) with 0.20 M perchloric acid HClO4(aq)? For methyl amine (CH3NH2), Kb = 3.6 x 10^-
At 298K, 125 ml of 0.60 M potassium hydroxide KOH is added to 175 ml of 0.40 M hydrochloric acid HCl. What is the final pH?
A 290ml flask contains pure helium at a pressure of 756torr . A second flask with a volume of 480ml contains pure argon at a pressure of 713torr .If the two flasks are connected through a stopcock
Its melting point is 962°C, and its heat of fusion is 11.3 kJ/mol. What quantity of heat, in joules, is required to change 7.50 g of silver from solid at 25°C to liquid at 962°C?
When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 7.0 M HCl is required to react completely with 8.00 g of magnesium?
Ammonia can be decomposed to give 3 parts by mass of hydrogen and 14 parts by mass of nitrogen. What mass of nitrogen is obtained if 1.27g of ammonia is decomposed?
The rate constant for the first order decomposition of a compound A in the reaction 2A=P is k= 2.78*10-7|s at 25oc. what is the half- life of A?
An environmental chemist needs a carbonate buffer of pH 10.00 to study the effects of acid rain on limestonerich soils. How many grams of Na2CO3 must she add to 1.5 L of freshly prepared 0.20 M NaHC
The solubility of silver sulfate in water is 0.223% (w/v) at 35°C. Calculate the solubility product of this salt at this temperature.
Determine the mass of aluminum acetate that can be made if you do the reaction with 125 grams of acetic acid and 275 grams of aluminum hydroxide.
If 450 ml of some Pb(NO3)2 solution is mixed with 600 ml of 3.70 x 10-2 M NaCl solution, what is the maximum concentration of the Pb(NO3)2 solution added if no solid PbCl2 forms?
The electron in a hydrogen atom is excited and makes a transition from n=2 to n=7. Calculate the energy of the photon absorbed in joules. Calculate the wavelength of the photon in meters.
A toothpaste contains 0.24 by mass sodium fluoride used to prevent dental caries and 0.30 by mass triclosan. How many moles of are in the tube of toothpaste?
what mass of limestone must have dissolved if 3.05x10^10 kg of calcium hydrogen carbonate was produced?
What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 0.950 atm and 70 degrees C?
The heat of fusion of ice (the heat associated with ice melting) is 6.0kJ/mol . Find the temepature of the coffer after the ice melts.
iron has a density of 7.874 g/cm3. what is the mass of a rectangular block of iron with dimensions of 3.000 cm by 4.000 cm by 5.000 cm?
If the metal pellet has a heat capacity of 0.570 J/(g•ºC) and the water has a heat capacity of 4.184 J/(g•ºC), what is the final temperature of both the water and the metal pelle