11/27/23

Write the balanced equation for the redox reaction corresponding to the charging process.
The half-reactions and their associated standard reduction potentials in nickel-cadmium batteries areNiO(OH)(s) + H2O (l)+ e- Ni(OH)2 ​(s)+ OH- (aq) E° = 1.32 VCd (OH)2 + 2e- Cd (s) + 2OH- (aq) ... more
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11/27/23

Delta H of soln
When a 3.00g sample of KBr is dissolved in water a calorimeter that has a total heat capacity of 1.32 kJ • K^-1, the temperature decreases by 0.380 K. Calculate the molar heat of solution of KBr.
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11/27/23

what is Delta H for this reaction (per mole H2O produced)?
In a constant-pressure calorimeter, 70.0 mL of 0.330 M Ba(OH)2 was added to 70.0 mL of 0.660 M HCl.The reaction caused the temperature of the solution to rise from 23.84 C to 28.34 C. If the... more
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11/27/23

Final temperature of water
The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all of the energy obtained from burning 1.27 lb of ethane (fuel value is 11.36) is... more
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11/27/23

What is the copper mass ?
A Block of copper has an initial temperature of 65.4C it’s immersed in a beaker containing 95.7 g of H2O. At 22.7C .Once the heat transfer is complete the temperature and block measures 24.2 C.... more
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11/27/23

Chemistry questions

Sodium azide, NaN3, undergoes a decomposition reaction to produce metallic sodium and nitrogen gas. If 43.2 g sodium azide decomposes in the reaction conducted at 792 torr pressure and 26.2 oC,... more
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11/23/23

How do I figure out the complete nuclear equation for the bombardent of a 9Be atom with an a particle to yield 12B
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11/22/23

A student mixes 20mL of 0.19M Ca(NO3)2 and 12 mL of 0.15M Na2CO3. If the student's dry precipitate weighs 0.169 g, what is the percent yield?
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11/22/23

Can someone help me attempt to understand this question?
Given the information: A + B -> 2D DeltaH = 704.7 kJ Delta S = 304.0 J/K C -> D DeltaH = 419.0 kJ Delta S = -205.0 J/KCalculate DeltaG at 298 K for the... more
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11/22/23

What is the quantity of heat (In KJ)
What is the quantity of heat (in kJ) associated with cooling 150.3 g of water from 25.60 °C to ice at -10.70 °C?Csolid = 2.092 J/g* C°Cliquid = 4.184 J/g* C°Tfusion = 0.00C°deltaHfusion = 6.01 KJ/Mol
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11/22/23

A combustion reaction between octane (C8H18) and oxygen produces carbon dioxide and water. If 3.98 mol of octane are burned in a complete combustion, how many moles of carbon dioxide are produced?

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11/21/23

Using the relationship given in part 1, calculate Ecell if [Cu2+] = 1.753 M and [Cr3+] = 0.00143 M, assuming that the temperature remains at 25°C. Give your answer to two places after the decimal.
Using the relationship given in part 1, calculate Ecell if [Cu2+] = 1.753 M and [Cr3+] = 0.00143 M, assuming that the temperature remains at 25°C. Give your answer to two places after the... more
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11/21/23

What mass of precipitate will form if 1.50 L of concentrated Pb ( ClO 3)2  is mixed with 0.750 L of 0.150 M NAI? Assume the reaction goes to completion.
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11/21/23

in the description

 sample of 8.49 g of liquid 1‑propanol, C3H8O, is combusted with 55.1 g of oxygen gas. Carbon dioxide and water are the products.Write the balanced chemical equation for the reactionWhat is the... more
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11/21/23

question is in the description
Carbonic acid, H2CO3, has two acidic hydrogens. A solution containing an unknown concentration of carbonic acid is titrated with potassium hydroxide. It requires 29.1 mL of 3.100 M KOH solution to... more
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11/21/23

in the description

The identity of an unknown monoprotic organic acid is determined by titration. A 0.436g sample of the acid is titrated with 0.185 M NaOH. What is the molar mass of the compound if 13.1 mL of the... more
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11/20/23

A 150.0 ml sample of 0.100 M HNO2 is titrated with 0.250 M KOH. The Ka for HNO2 is 4.57*10^-4. Calculate the pH at equivalence point
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11/20/23

Will a precipitate form when there is 1.29*10^-2 M Sr+2 and 2.3*10^-6 M CrO4^2-? The Ksp=4.00*10^-5. What is the formula of the precipitate? Will a precipitate form?
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11/20/23

Calculate the pH of a buffer solution that is 0.0876 M in benzoic acid (HC7H5O2) and 0.565 M in sodium benzoate (NaC7H5O2). For benzoic acid, Ka=6.54*10^-5.

Calculate the pH of a buffer solution as an equilibrium problem and with the henderson-hasselbalch equation.
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11/20/23

the solubility of PbCl2 is 0.232 g per 48.5 ml of solution at 25 degrees C. determine the value of the solubility product constant for PbCl2
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11/20/23

What is the concentration in molarity of a 1.32 L solution that contains 22.5 g of dissolved copper (II) chloride?
If anyone could help it would be nice :). So, I understand to get the concentration in molarity you would need to make 22.5 grams of copper II chloride over the 1.32 solution, multiplying that by 1... more
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11/19/23

chemistry problem

For a He⁺, calculate the wavelength of light (in m) that would be emitted for the orbital transition of n(initial) = 3 to n(final) = 2. Submit an answer to four significant figures. The Rydberg... more
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11/19/23

Chemistry Problem

For a hydrogen atom, calculate the energy of the photon that would be emitted for the orbital transition of n(initial) = 4 to n(final) = 1. The Rydberg constant is 1.09678 x 10⁷ m⁻¹. Report to four... more
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11/18/23

Calculate the Pressure
Calculate the pressure (in atm) of a 6.70 mol sample of methane gas at 350.0 K in a 1.50 L container using the van der Waals equation. For methane, a = 2.25 L²･atm/mol² and b = 0.0428 L/mol.
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11/17/23

Calculate the size of electric current that must flow.
Suppose 500. mmol of electrons must be transported from one side of an electrochemical cell to another in 60.0 minutes. Calculate the size of electric current that must flow.Be sure your answer has... more
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