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0
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What is the specific surface area of a sample of activated carbon if it adsorbs 0.45 g of nitrogen gas at 77 K and a pressure of 1 atm, assuming a monolayer of adsorbate and that the nitrogen gas occupies a volume of 22.4 L/mol?
asked
Mar 1
in
Surface Chemistry
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votes
1
answer
39
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What is the specific surface area of a sample of activated carbon with a BET value of 1000 m²/g, given that the mass of the sample used for the measurement is 0.5 g?
asked
Mar 1
in
Surface Chemistry
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votes
1
answer
31
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What is the specific heat capacity (in J/g°C) of copper if 100 grams of the metal absorbs 1500 J of heat and its temperature increases by 20°C?
asked
Mar 1
in
Chemical thermodynamics
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votes
1
answer
41
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What is the specific heat capacity of a substance that requires 2510 J of energy to increase the temperature of a 50 g sample by 10 °C?
asked
Mar 1
in
ThermoChemistry
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1
answer
40
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What is the reaction rate of the decomposition of 2 moles of hydrogen peroxide in the presence of a catalyst at 25°C and 1 atm pressure, if the concentration of the catalyst is 0.1 M and the decomposition takes place within 20 seconds?
asked
Mar 1
in
Chemical reactions
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1
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33
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What is the value of the reaction quotient Q for the following chemical reaction at a temperature of 25°C, given the concentrations of reactants and products: 2H2(g) + O2(g) → 2H2O(g) [H2] = 0.25 M [O2] = 0.15 M [H2O] = 0.20 M
asked
Mar 1
in
Chemical thermodynamics
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votes
1
answer
20
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What is the reaction quotient for the following chemical reaction at 25°C, with concentrations of products and reactants as follows:2NOBr(g) ⇌ 2NO(g) + Br2(g)[NO]^2[Br2] / [NOBr]^2
asked
Mar 1
in
Chemical thermodynamics
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1
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27
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What is the reaction quotient for the equilibrium system at 298K if the concentrations of reactants and products are [NO]= 0.85 M, [O2]= 0.12 M, and [NO2]= 0.17 M, respectively for the reaction: 2 NO (g) + O2 (g) ⇌ 2 NO2 (g)?
asked
Mar 1
in
Chemical thermodynamics
0
votes
1
answer
41
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What is the reaction quotient (Q) for the following reaction at 298K, if the partial pressures of reactants and products are as follows:2NO2(g) ⇌ 2NO(g) + O2(g)[NO2] = 0.5 atm, [NO] = 0.3 atm, and [O2] = 0.7 atm.
asked
Mar 1
in
Chemical thermodynamics
0
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1
answer
35
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What is the rate of the reaction if 2 moles of substance A react with 1 mole of substance B in 10 seconds, assuming it follows first-order kinetics with a rate constant of 0.5 s^-1?
asked
Mar 1
in
Chemical reactions
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votes
1
answer
33
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What is the rate of reaction when 2 mol of hydrogen gas (H2) react with 1 mol of oxygen gas (O2) to form 2 mol of water (H2O) in 10 minutes at a constant temperature and pressure of 1 atm?
asked
Mar 1
in
Chemical reactions
0
votes
1
answer
45
views
What is the rate of reaction for the combustion of methane in which 4.7 grams of methane reacts in 3.5 seconds to produce 11.2 grams of water vapor and carbon dioxide gas?
asked
Mar 1
in
Chemical reactions
0
votes
1
answer
51
views
What is the rate of polymerization of vinyl acetate if the initial concentration of initiator is 0.05 mol/L, the rate constant at the polymerization temperature is 0.04 s^-1, and the reaction temperature is 60°C?
asked
Mar 1
in
Polymer Chemistry
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votes
1
answer
36
views
What is the rate of electroplating in a cell with a current of 2.5 A passing through it for 1 hour if the mass of the metal deposited on the cathode is 0.456 g? (assume a 100% yield and use the appropriate formula to calculate the rate).
asked
Mar 1
in
ElectroChemistry
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votes
1
answer
31
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What is the rate of diffusion of oxygen through a 2 cm thick slab of air at 25°C and 1 atm pressure? The diffusivity of oxygen is 0.20 cm^2/s.
asked
Mar 1
in
Physical Chemistry
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votes
1
answer
41
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What is the rate of diffusion of oxygen in the air at standard temperature and pressure when the molecular weight of oxygen is 32 g/mol and the diffusion coefficient is 0.188 cm^2/s?
asked
Mar 1
in
Physical Chemistry
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1
answer
46
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What is the rate of diffusion of oxygen gas at 25°C and 1 atm pressure, if it diffuses through a platinum sheet with a thickness of 0.1 mm and a surface area of 10 cm²? The diffusion coefficient of oxygen in platinum is 2.2 x 10^-5 cm²/s.
asked
Mar 1
in
Physical Chemistry
0
votes
1
answer
36
views
What is the rate of diffusion of nitrogen gas in air at 25°C and 1 atm pressure, if the molecular weight of nitrogen is 28 g/mol and the average velocity of the gas molecules is 500 m/s?
asked
Mar 1
in
Physical Chemistry
0
votes
1
answer
26
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What is the rate of diffusion of helium gas (He) in air at 25°C and a pressure of 1 atm?
asked
Mar 1
in
Physical Chemistry
0
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1
answer
38
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What is the rate of diffusion of carbon dioxide (CO2) gas in air at a temperature of 25°C and a pressure of 1 atm if the molar mass of CO2 is 44 g/mol?
asked
Mar 1
in
Physical Chemistry
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