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Calculation of the activation energy in cal/mol for a recrystallisation reaction.
If it takes 80 h to completely recrystallize an aluminium sheet at 250oC and 6 h at 3000oC, calculate the activation energy in cal/mol?
Describe how you would prepare the buffer solution using one of the weak bases listed in the Table below and any other necessary reagents.
Question- Salt water can effectively loosen up the cellular content because it weakens many inter-molecular interactions. Which of the following inter-molecular forces, however, cannot be weakened by salt water
"Hard" water contains relatively high concentrations of dissolved calcium ions. Calculate the solubility (in molarity) of CaHPO4·2H2O at 25°C in hard water that initially contains 95 mg/L of Ca2+
Calculate the pH of a buffer solution prepared by dissolving 23.4 g benzoic acid (HC7H5O2) and 35.0 g sodium benzoate in 215.0 mL of solution.
A gas company in Boston charges $1.30 for 15.0ft3(cube) of natural gas,if it takes 0.304ft3(cube) of gas to boil a liter of water.starting at room temperature(25 degree Celsius),how much would it cost to boil 2.1-L kettle of water
Question- What is the pH at the equivalence point in the titration of 100 mL of 0.25 M HCN (Ka = 4.9 x 10^-10) with 0.25 M NaOH
The steam is comes out of the feed water at 200 C. The water at a flow rate of 500 kg/h enters the feed water heater at 20C. Calculate the feed water exit temperature.
Explain what mechanistic rationale can account for the formation of this (these) product(s)? Explain what can be done experimentally to ensure that all of the stilbene is used up in the reaction that is it is the limiting reactant
A 25.0-mL aliquot of vinegar was diluted to 250 mL on a volumetric flask. Titration of 50.0-mL aliquots of the diluted solution required an average of 34.88 mL of 0.09600 M NaOH. Express the acidity of the vinegar in terms of the percentage (w/v) ..
If several large air bubbles entered the graduated cylinder filled with water when it was inverted into the water trough, what would the effect be on a plot of volume H2(g) vs. mass Mg?
The atomic mass of Potassium 39 is 38.96371 AMU. Calculate the binding energy for a mass of this nuclide using 1.008665 AMU for the mass of the neutron, 1.007276 AMU for the mass of the proton, 0.00054858 AMU for the mass of the electron
5.00 ml of a water sample was titrated for hardness with 4.15mL of 0.0200M EDTA. Write an equation for the reaction and calculate the hardness of the water in ppm
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