09/07/23

Chemistry Calorimeter/ heat capacity
The combustion of toluene has delta E rxn of -3.91x10^3 kj/mol. When 1.55g of toluene (C7H8) undergoes combustion in a bomb calorimeter, the temperature rises from 23.12 Celsius to 37.57 Celsius.... more
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09/07/23

Chemistry what is the answer.

A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 84.0 mL.84.0 mL. The liquid solvent has a mass of 35.9 g35.9 g and a density... more
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09/06/23

what will the rate constant be at 276.0 °C?
The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy Ea = 59.0 kJ/mol. If the rate constant of this reaction is 6.7 × 102 M-1•s-1 at... more
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09/06/23

Use this data to answer the following questions.
A chemistry graduate student is studying the rate of this reaction:2HI (g) -> H2 (g) + I2 (g)She fills a reaction vessel with HI and measures its concentration as the reaction proceeds: Time... more
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09/06/23

Construct a Born-Haber cycle and use it to calculate the first electron affinity of chlorine.
ΔHatm(Cl) = +122 kJ/molΔHatm(Mg) = +148 KJ/molΔH1st ionisation energy(Mg) = +738 kJ/molΔH2nd ionisation energy(Mg) = +1451 kJ/molΔHlattice energy(MgCl2) = -2526 kJ/molΔHformation(MgCl2) = -641 kJ/mol
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09/06/23

Calculate how long it takes
At a certain temperature the rate of this reaction is second order in NH4OH with a rate constant of 0.012M-1•s-1NH4OH (aq) -> NH3 (aq) + H2O (aq)Suppose a vessel contains NH4OH at a... more
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09/06/23

After how much time is there only 225. mmol left?
Under certain conditions the rate of this reaction is zero order in hydrogen iodide with a rate constant of 0.0011 M•s-1.2 HI (g) -> H2 (g) + I2 (g)Suppose a 250. mL flask is charged under these... more
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09/06/23

Calculate the concentration

Consider this reaction:2SO3(g) -> 2SO2 (g) + O2 (g)At a certain temperature it obeys this rate law.rate = (3.67 M-1 .s-1) [SO3]2Suppose a vessel contains SO3 at a concentration of 0.970M.... more
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09/06/23

What will the concentration be 224 minutes later?
The rate at which a certain drug is eliminated by the body follows first-order kinetics, with a half life of  56 minutes.Suppose in a particular patient the concentration of this drug in the... more
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09/06/23

Consider this reaction
Consider this reaction:2N2O5 (g) -> 2N2O4 (g) + O2 (g)At a certain temperature it obeys this rate law.rate = (0.147 s-1) [N2O5]Suppose a vessel contains N2O5, at a concentration of 1.15M.... more
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09/04/23

Find K for the reaction: CH4 (g) + O2 (g) ⇌ CH2O (g) + H2O (g)
Given the following equilibrium equations and their corresponding equilibrium constants:CO2 (g) + H2O(g) ⇌ O2 (g) + CH2O (g) K1 = 6.1 x 108CH4 (g) + 2O2 (g) ⇌ CO2 (g) + 2H2O (g) ... more
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09/04/23

Percentage Purity of magnesium oxide

1.10 g of impure magnesium oxide (MgO) was dissolved in 25.0 mL of 3.20 mol L–1 hydrochloric acid. The resulting solution was diluted to 250 mL in a volumetric flask. 20.0 mL of this diluted... more
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09/02/23

A certain ore is 27.3% nickel by mass. How many kilograms of this ore would you need to dig up to have 40.0 g of nickel?
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08/31/23

Use this information to write a rate law for this reaction, and calculate the value of the rate constant k.
Some measurements of the initial rate of a certain reaction are given in the table below. [N2] [H2] initial rate of reaction 1.87 M 1.78 M 25.0 M/s 1.87 M 0.403 M 1.28 M/s 3.98 M 1.78 M 113.... more
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08/31/23

Use this information to write a rate law for this reaction, and calculate the value of the rate constant k
Some measurements of the initial rate of a certain reaction are given in the table below. [N2] [H2] initial rate of reaction 1.36 M 0.913 M 0.484 M/s 1.36 M 4.35 M 11.0 M/s 4.53 M 0.913... more
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08/31/23

General Chemistry
The rate constant for the reaction is 0.620 M−1⋅s at 200 ∘CA⟶productsIf the initial concentration of A is 0.00670 M, what will be the concentration after 115 s?
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08/31/23

General Chemistry
The reactionC4H8(g)⟶2C2H4(g)C4⁢H8⁡(g)⟶2⁢C2⁢H4⁡(g)has an activation energy of 262 kJ/mol.262 kJ/mol. At 600.0 K,600.0 K, the rate constant, 𝑘, is 6.1×10−8 s−1. What is the value of the rate constant... more
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08/31/23

calculate the mass
A certain organic compound O has a solubility in acetonitrile of 72.6 g/L at 5. °C. Calculate the mass of O that's dissolved in 300. mL of a saturated solution of O in acetonitrile at this... more
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08/31/23

calculate the mass
At 25.0 °C the Henry's Law constant for sulfur hexafluoride (SF6) gas in water is 2.4 x 10^-4 M/atm. Calculate the mass in grams of SF6 gas that can be dissolved in 800. mL of water at 25.0 °C and... more
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08/31/23

calculate the volume
The solubility in acetone of organic compound O is measured and found to be 0.527 g/mLat 10. °C. Calculate the volume of a saturated solution of O in acetonethat would contain 390. mg of O at this... more
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08/31/23

Calculate the mass of O
 A certain organic compound has a solubility in acetonitrile of 72.6 g/L at 5. C. Calculate the mass of O that's dissolved in 300. mL of a saturated solution of O in acetonitrile at this... more
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08/31/23

The vapor pressure of ethanol, CH3CH2OH , at 35.0 °C is 13.67 kPa . If 2.01 g of ethanol is enclosed in a 2.50 L container, how much liquid will be present?
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08/31/23

Chemistry help!
I think its the program but I know the answer is 87.5. I was wondering If anyone could help me set it up by chance.Question: What volume of 0.100 M HCl solution is needed to neutralize 25.0 mL of... more
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08/30/23

Determine the mass in grams of 0.248 gal of hexane. The density of hexane is 0.659 g/mL.
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08/29/23

50 mL of 0.2 M KOH is added to 150 mL of 0.1 M acetic acid. What is the pH change of the acetic acid solution caused by the addition of KOH? (Ka of acetic acid is 1.8x10-5)
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