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Calculate the partial pressures of the three gases remaining at the completion of the reaction if the total pressure due to the mixture is 5.00 atm.
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 103kJ of heat?
You need to make 1.00 kg of a 22.5% ammonium chloride solution. How many grams of ammonium chloride do you use? What volume of water will be used?
A weather report gives a current atmospheric pressure reading of 546.5 mm Hg. Express this reading in atmospheres.
A solution is prepared by adding 1.75 mg of an unknown protein to enough water to make a 13.5 mL solution. The osmotic pressure of the solution is measured to be 1.6E-3 bar at 25 C. What is the calc
Write a chemical equation for the titration with methyl orange the weak base used was sodium carbonate and the weak acid used was HCl
While performing the assays for the LDH kinetics experiment, you will pipet 10 ul of 250 ug/ml LDH into 990 ul of assay buffer (Tris, Lactate, and NAD). What is the final concentration of LDH in th
Which of the four main categories of biological compounds-carbohydrates, lipids, proteins, and nucleic acids-contains the highest concentration of calories?
If k = 2 x 10^-5 L/mol-sec at 25 degrees C and k = 2 x 10^-4 L/mol -sec at 100 degrees C, determine the activation energy Ea in Joules/mol.
What is the definition of the joule in terms of the basic SI units?
Describe the main components of the Liquid Chromatography-Mass Spec and how they are used in sample identification. (Imagine that you follow the sample through the LC-MS: describe what is happening
There are many types of covalent bonds with varying polarities, and there are also multiple covalent bonds (double, triple) Which ones are stronger than ionic bonds, and which ones are weaker?
A first-order reaction had a rate constant , k , of 0.0123 1/s. If the initial concentration of reactant is 1.25M , what will be the concentration of reactant after 10 minutes? show your work.
An aqueous dextrose solution having a density of 1.04 g/cm3 freezes at -1.15°C. Find the osmotic pressure of this solution at 25°C. Kf of water is 1.86 °C/m; molecular mass of dextrose =
What is the molar concentration of 20.0 mL of an aqueous solution of HCl that requires 32.0 mL of 0.0260 M solution of NaOH for complete neutralization?
Assess the value obtained, indicating why the result is only an estimate and whether the actual radius should be larger or smaller than the estimate.
A glycine buffer is prepared by mixing 100 mL of 1.0M glycine, pH 6.0, with 100 mL of 0.5M NaOH and 300 mL of water. The pKa values for glycine are 2.4 and 9.6. What is the concentration of the buff
The specific heat of toluene, C7H8, is 1.13 J/g K. How many joules of heat are needed to raise the temperature of 50.0 g of toluene from 12.0°C to 30°C?
A point mass rotates in a circle with l = 1. Calculate the magnitude of its angular momentum and the possible projections of the angular momentum on an arbitrary axis.
The solubility of ammonium chloride at 30.0 C is 41.1 g per 100 g of water. what is the maximum amount in grams of ammonium chloride that will dissolve in 4455.0 g of water at this temperture?
The rate constant for this reaction is 3.0 X 102 s-1. How long does it take for the concentration of N2O4 to change from 1.000 M to 0.125 M?
A .900g sample of water is injected into a 10.0 liter flask at 55 degrees C. How much H2O (l) remains if any, remains in the flask once equilibrium is reached? The vapor pressure of water at 55 C is
Question: A bag contains ten counters, of which six are red and four are green. A count is chosen at random; its colour is noted and it is replaced in the bag. A sound counter is then chosen at rand
An aqueous CaCl2 solution has a vapor pressure of 83.0 mmHg at 50 degrees celsius. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass perce
When Dr. Farrell was a graduate student, he once made up a pH 8.0 sodium acetate buffer. Why would the casual observer to this buffering faux pas come tot eh conclusion that he had the intellectual