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Erythromycin is a weak base that has a pkb of 5.20. Twenty-five ml of 0.30 M solution of erythromycin is titrated with 0.35 M nitirc acid .
Calculate the pH in each of the following additions of acid.
(a) 2/7 of the way to the equivalence point:
(b)1.5 mL after midpoint:
(c) at the equivalence point
(d) after 40 mL has been added:
Convert lb mol CaC2 feed to lb and calculate lb inerts added. The total lb solids in the slurry is then the sum of the Ca(OH)2 plus inerts. In calculating the water added, remember that some is consumed in the reaction.]
Consider the following thermochemical equation: CH4(g) + I2(g) --> CH3I(g) + HI(g) Enthalpy Value = +23 kJ
Calculate delta E for the combustion of a gas that releases 195.0 kJ of energy to its surroundings and does 54.5 kJ of work on its surroundings.
How much energy (in kilojoules) is required to convert 205 mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL?
At a temperature of 60 ºC, about 0.8 g CO2 can be dissolved in 100 g water. what would be the mass of CO2 which can be dissolved in 100 g water at 10 ºC?
Assume that a particular reaction evolves 250 kj of heat and that 34 kj of PV work is gained by the system. What is the enthalpy?
When a sample of Vanillin weighing 2.500g burns in Oxygen, 5.79g of carbon dioxide and 1.18g of water is obtained. What is the empirical formula of Vanillin?
Consider the reaction of 5.0 moles of CS2 and 3.0 moles of NaOH according to the following reaction 3 CS2 + 6 NaOH -> 2 Na2CS3 + Na2CO3 + 3 H2O.
Calculate the energy in kJ/mol of a mol of photons in the gamma ray region of the electromagnetic spectrum that has a wavelength of 4.13 pm. Express answer in scientific notation.
How many grams of caffeine (C8H10N4O2) are present in one cup of coffee that contains 8.98 × 1021 caffeine molecules?
For the neutralization reaction involving HNO3 and Ca(OH)2, how many liters of 1.55 M HNO3 are needed to react with 45.8 mL of a 4.66 M Ca(OH)2 solution?
The Solubility of Mg(OH)2 (s) in wataer at a certain temperature is 1.0 x 10^-4 mol/L. Calculate the value of Ksp for Mg(OH)2 (s) at this temperature.
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