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A sample of a white powder was analyzed in the laboratory and found to be composed of 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass. Determine the empirical formula of the compound.
asked
Jan 22
in
Inorganic Chemistry
by
BettyWalsh4
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2.0k
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0
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1
answer
175
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A sample of a compound was analyzed and found to contain 52.35 % iron, 13.82 % sulfur, and 33.83 % oxygen by mass. Determine the empirical formula of the compound.
asked
Jan 22
in
Inorganic Chemistry
by
OliviaMilton
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2.0k
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0
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1
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44
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A sample of a compound contains 28.6% sodium, 46.8% sulfur, and 24.6% oxygen. Determine the empirical formula of this inorganic compound.
asked
Jan 22
in
Inorganic Chemistry
by
ErmelindaSey
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1.8k
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1
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111
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A sample of 55.0 g of ethanol at 25°C is vaporized at its normal boiling point. The enthalpy of vaporization for ethanol is 38.56 kJ/mol. Calculate the amount of heat energy required for this process.
asked
Jan 22
in
ThermoChemistry
by
CamillePiazz
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1.8k
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0
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1
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47
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A researcher is working on the desorption of a specific gas from a metal surface. The enthalpy of desorption for this process is -23.4 kJ/mol. If the researcher desorbs 0.75 moles of the gas, how much heat is released (or absorbed)?
asked
Jan 22
in
ThermoChemistry
by
AbbieGladden
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2.1k
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0
votes
1
answer
38
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A redox reaction is at equilibrium with a standard cell potential of +0.54 V. If the concentration of the oxidizing agent is increased by a factor of 5, what effect will this have on the position of the equilibrium and the cell potential? Assume that the reaction takes place at 25°C.
asked
Jan 22
in
Chemical equilibrium
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73351052550
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1.9k
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A reaction mixture initially contained 0.1 mol/L of reactant A and 0.2 mol/L of reactant B. When a catalyst was added, the rate of conversion of A and B to the product increased significantly. Calculate the new equilibrium concentration of reactant B if the equilibrium constant of the reaction is 0.1 and the initial equilibrium concentration of the product is 0.05 mol/L. Assume that the catalyst does not change the equilibrium constant.
asked
Jan 22
in
Chemical equilibrium
by
Shawn33B4717
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1.9k
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0
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1
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29
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A reaction in a container has an equilibrium constant of K = 5.0 x 10^-3 at a particular temperature. If the volume of the container is suddenly decreased by a factor of 2, what will happen to the concentration of each of the reactants and products at equilibrium? Use the reaction below:2A + B ⇌ 3C + D
asked
Jan 22
in
Chemical equilibrium
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PeteWirtz263
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2.1k
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0
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1
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58
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A question for the student to solve could be: If a certain equilibrium reaction is exothermic, and the concentration of reactant A is increased while the concentration of product B is decreased, predict the change in the equilibrium constant value (K) and explain your reasoning by applying Le Chatelier's principle.
asked
Jan 22
in
Chemical reactions
by
ClairWaite7
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1.8k
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1
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A piece of zinc metal is placed in a beaker containing an acidic solution, while a copper electrode is also placed in the same solution. The copper electrode is connected to the positive terminal of a voltmeter, while the zinc electrode is connected to the negative terminal of the voltmeter. If the measured potential between the two electrodes is -0.76 V, what is the corrosion potential of the zinc electrode?
asked
Jan 22
in
ElectroChemistry
by
JodieBaskett
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1.8k
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0
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1
answer
86
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A piece of metal with a mass of 15 grams initially at 25°C is placed in 50 mL of water at 80°C. After the metal has reached thermal equilibrium with the water, its temperature is 30°C. Calculate the specific heat capacity of the metal.
asked
Jan 22
in
ThermoChemistry
by
IsabellFrome
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2.1k
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0
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1
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40
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A metal rod of 3 cm diameter and 20 cm length is placed in a solution of hydrochloric acid with a pH of 2 at 25°C. The metal has a critical pitting temperature of 40°C and a standard electrode potential of -0.44V. Assuming that the rod is polarized to a potential of -0.50V, what is the corrosion current density (in mA/cm²) of the metal in the given environment?
asked
Jan 22
in
ElectroChemistry
by
DemetriusCha
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1.7k
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0
votes
1
answer
23
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A metal rod made of iron is coupled with a zinc rod in an aqueous medium. If the corrosion potential of the iron rod is -0.44 V and that of the zinc rod is -0.76 V, calculate the corrosion current density of the iron rod when coupled with the zinc rod at 25°C. The polarization resistance of the iron rod is 880 Ωcm².
asked
Jan 22
in
ElectroChemistry
by
Damon31M1921
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2.4k
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0
votes
1
answer
152
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A metal electrode immersed in a solution is used to convert a chemical reaction into an electric current. The electrode potential is measured as the voltage difference between the metal and the solution. The cathodic and anodic Tafel slopes are then calculated in order to determine the rate of the chemical reaction occurring at the electrode. Given a metal electrode immersed in a 0.1 M solution of AgNO3, the cathodic and anodic Tafel slopes are determined to be 120 mV/decade and 110 mV/decade, respectively. Calculate the exchange current density for the reaction occurring at the electro
asked
Jan 22
in
ElectroChemistry
by
LynwoodLundg
(
1.5k
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0
votes
1
answer
130
views
A laboratory made a buffer solution by mixing 25 mL of 0.10 M acetic acid (Ka = 1.8 x 10^-5) with 15 mL of 0.20 M sodium acetate solution. Calculate the pH of the buffer solution assuming both the acid and the acetate ions are completely dissociated.
asked
Jan 22
in
Chemical reactions
by
OrenDarwin6
(
1.9k
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0
votes
1
answer
90
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A laboratory assistant is asked to prepare a buffer solution with a pH of 7.10 using acetic acid (CH3COOH) and sodium acetate (NaCH3COO). If the laboratory assistant has 250 mL of 0.20 M acetic acid, how many grams of NaCH3COO will be needed to make the buffer solution?
asked
Jan 22
in
Chemical reactions
by
ReinaldoMunz
(
1.2k
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0
votes
1
answer
102
views
A gas-phase reaction A ⇌ B is known to have a rate constant of 0.05 L/mol/s at 300 K. If the initial concentration of A is 0.1 M and the system reaches equilibrium after 2 minutes, what is the concentration of B at equilibrium? (Assume constant pressure and ideal gas behavior)
asked
Jan 22
in
Physical Chemistry
by
RemonaPinto
(
1.8k
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0
votes
1
answer
81
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A gas phase reaction occurs according to the following equation: A(g) + 2B(g) -> C(g) + D(g)The reaction is carried out at a total pressure of 2 atm and at 298 K. The initial concentrations of A and B are 0.1 M and 0.2 M, respectively. The rate of formation of C is measured to be 0.02 M/s. What is the rate of disappearance of B?
asked
Jan 22
in
Physical Chemistry
by
EmanuelWaldo
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2.0k
points)
0
votes
1
answer
99
views
A gas mixture contains equal parts of hydrogen and helium gases in a container at a temperature of 300 K. Determine the total internal energy of the gas mixture using the grand canonical ensemble model.
asked
Jan 22
in
Physical Chemistry
by
HermineOverb
(
2.1k
points)
0
votes
1
answer
153
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A gas is contained in a cylinder at a pressure of 1 atm and a temperature of 25°C. The cylinder is fitted with a piston that can be moved to change the volume. The gas is allowed to expand irreversibly to a final pressure of 0.5 atm, and the temperature is kept constant. Calculate the work done by the system, and determine if the process is endothermic or exothermic.
asked
Jan 22
in
Physical Chemistry
by
NickolasShum
(
1.9k
points)
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