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15.0 g of a known pure sample of quinine harvested from cinchona bark is dissolved in the ethanol to produce the 50.0 mL of solution at 25°C.
Determine the mass of conjugate acid and base required to prepare the buffer. Determine the volume of NaOH and HCl that must be added.
Determine the total energy of the photons detected in one hour if the detector is capturing 9x107 photons per second at this wavelength.
When the final image distance is around 25.0 cm from the eyepiece, determine the real diameter of the red blood cell?
50 mL of deionizer water at the 82.3 degrees C are added to the calorimeter containing 50 mL of deionizer water at 21.1 degrees C. The final temp of the water is 50 degrees C.
An electron in a TV picture-tube is accelerated from the rest via a potential difference of around 10 kV before it strikes the screen. Determine the velocity of the electron just as it strikes the
What mass of iron is needed to prepare 15.16 g of the iron chloride product in the reaction of iron and chlorine if, under the conditions of the reaction, the electron configuration of the iron cat
Explain how much potassium chlorate is required to form the 20.0 mL of oxygen gas at the 670 mmHg and 20oC given the equation: 2KClO3(s) →2KCl(s) +3O2(g)?
Determine how many grams of CO are produced at 298 K? At 1000 k if excess C is allowed to react with 25.0 g of CO_2 in a 3.00-Lflask.
If melting ice to water at 0°C requires 6.01 kJ/mol, determine the fewest number of laser pulses need to melt 10.0 g of ice when a single pulse of a laser yields an average of 5.00 ×1018&
A 0.8870-g sample of a mixture of KCl and NaCl is dissolved in the water, and the solution is then treated with an excess of AgNO3 to yield 1.822g of AgCl. Determine the percent by mass of
Write down the nuclear reaction of the bombardment of beryllium-9 by an alpha particle, producing the carbon 12 and a particle uranium239 can be produced by the bombardment of uranium 238.
The total of $12,000 is invested in 2 funds paying 9% and 11% simple interest. If interest for first year is $1,180, how much of $12,000 is invested at 9%?
The minimum energy required to knock an electron out of an atom of cesium is 3.43 x 10-19 J. Cesium metal is used in the photocells of automatic door openers.
Discuss the efficiency of elution process to separate cations and anions in solutions which are having the Na, Cu, CrO4, & Cl and suggest how the separation can be improve?
Determine the bulk density, in units of g.mL-1, of a metal with an atomic mass of 80.0 g.mol-1. This metal has an FCC crystal structure with a unit cell dimension of a = 0.160 nm.
Find value of the investment (if you have 100 shares before split) before and after split? How has split changed (or not changed) overall value of the investment in Pohlman?
A student reacts 50.0 g of silver (I) nitrate with 20.0 g of copper metal to prepare copper (II) nitrate and silver metal.Write down the net ionic and total ionic equations for this reaction.
In a coffee cup calorimeter, 50.0ml of 1.00M NaOH and 50.00ml of1.00M HCI are mixed. Both solutions were originally at24.6.C.After the reaction, the final temperature is 31.3.C.
Explain how much heat was released in this experiment by the combustion of butane? Where the specific heat of water is 4.18 J/gram degree.
Determine the total pressure (atm) of a gas mixture of 0.475 grams of He and 0.726 grams Ne in an 763 mL container at the 150°C?
Calculate the heat capacity of this calorimeter. The combustion of 0.1584 grams of benzoic acid increases the temperature of a calorimeter by 2.54.C. The energy released by the combustion of benzoic
The molar conductance at infinite dilution of AgNO3, NaNO3 and NaCl are 116.5, 105.2 and 110.3 ohm-1cm2mole-1 respectively. Based on this, identify the molar conductance of AgCl at infinite dilut
The resistance of a cell containing the solution at the same temperature was found to be 55ohm. The specific conductance of 0.1N (Normality) KCl solution at the 230C is 0.012ohm-1cm-1. Calculate the
Based on the reaction 4/3Al + O2 --->2/3Al2O3 and ΔG = -827KJ/mole ofO2; Determine the minimum EMF needed to carry out and electrolysis of the Al2O3. (Given F = 96500 Cmole-1)