10/31/22

What is the number of formula units in a 1.87 mol sample of FeCl3
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10/31/22

Calculate the pKa of lactic acid
Calculate the pKa of lactic acid (CH3CH(OH)COOH) given the following information.40.0 mL of 0.2 M KOH are added to 100. mL of a 0.500 M lactic acid solution producing a pH of 3.134.
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10/31/22

What is the minimum concentration?
An aqueous solution at room temperature is 0.25 M in both Ba²⁺ and Ca²⁺ ions. You want to separate these two ions by selective precipitation using carbonate. What is the minimum concentration of... more
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10/31/22

What is the equilibrium concentration?
350. mL of 3.2 M Pb(NO₃)₂ and 200. mL of 0.020 M NaCl are added together. The Ksp for lead(II) chloride is 1.6 x 10⁻⁵. What is the equilibrium concentration of the chloride ion when all PbCl₂(s)... more
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10/31/22

What is the pH?
What is the pH of a saturated solution of Zn(OH)₂? (Ksp for Zn(OH)₂ = 3.0 × 10⁻¹⁶).
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10/31/22

What is the solubility?
What is the solubility of PbF₂ in a solution that contains 0.0850 M Pb²⁺ ions? (Ksp of PbF₂ is 3.60 × 10⁻⁸)
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10/31/22

For each of the scenarios, identify the order with respect to the reactant, A. A⟶products The half‑life of A is independent of the initial concentration of [A]. order:
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10/31/22

How would you find the solution for E?
A certain shade of blue has a frequency of 7.21×1014 Hz. What is the energy of exactly one photon of this light? Planck's constant is ℎ=6.626×10−34 J⋅s.𝐸
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10/31/22

How to find the solution?
Microwave ovens emit microwave energy with a wavelength of 12.6 cm. What is the energy of exactly one photon of this microwave radiation?𝐸=
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10/31/22

Which is possible and which is impossible?
Which of the subshell designations are possible and which are impossible?3p, 0p, 1s, 2d, 1f
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10/31/22

How do you solve for this solution?
A liquid is exposed to infrared radiation with a wavelength of 3.71×10−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons are required for the liquid to... more
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10/31/22

The reaction C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the rate constant, 𝑘, is 6.1×10−8 s−1. What is the value of the rate constant at 770.0 K?

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10/31/22

name the following structure
CH3CH2CH2CH(double bond oxygen)CH3CH2CH2C(double bond oxygen)CH2CH2CH2CH3
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10/31/22

A certain reaction has an activation energy of 50.75 kJ/mol. At what Kelvin temperature will the reaction proceed 3.00 times faster than it did at 313 K?
can you please show me the formula with the answer
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10/30/22

Calculating enthalpy
The ΔH for the oxidation of S in the gas phase to SO3 is -204 kJ/mol and for the oxidation of SO2 to SO3 is 89.5 kJ/mol. Find the enthalpy of formation of SO2 under these conditions.
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10/30/22

Gas Stoichiometry Chemistry
 A sample of propane (C3H8) gas was burned with excess oxygen gas. If 4.20 L of CO2 were produced from the reaction of at STP, how many liters of propane were used in the reaction?
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10/29/22

1C6H12O6(aq)---->2C2H5OH(l)+2CO2(g)
If  350.0 g of glucose yields 103.0 mL of ethanol, what is the percent yield for the reaction?
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10/29/22

How many electrons in an atom could have these sets of quantum numbers?
How many electrons in an atom could have these sets of quantum numbers?1.𝑛=2n=22.𝑛=4,ℓ=13.𝑛=7,ℓ=1,𝑚ℓ=−1
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10/29/22

Identify the atom with the ground-state electron configuration shown for its valence shell. 4𝑠23𝑑10
Identify the atom with the ground-state electron configuration shown for its valence shell.4𝑠23𝑑10symbol?
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10/29/22

Give the full electron configuration for the followings...
Give the full electron configuration for the followings...1.calcium (Ca).2.chlorine (Cl).3.Te4.[Kr]
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10/29/22

A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.3 nm. What is the final state of the hydrogen atom? Values for physical constants can be found in the Chempendix.
A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.3 nm.92.3 nm. What is the final state of the hydrogen atom? Values for physical constants can be found in... more
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10/29/22

Ethyl 2 Cyanoacrylate reaction with Sodium Bicarbonate
I saw on youtube that adding baking soda to super glue which was most of the time ethyl 2 cyanoacrylate seemed to make a really strong bond so i searched on google why that was and turns out that... more
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10/29/22

How many grams of oxygen gas are needed to react completely with 27.442 grams of sulfur dioxide gas? SO2(g) + O2(g) --> SO3(g) (needs to be balanced)
on this problem, please follow the instruction:  to calculate the molar mass, we round the numbers from the periodic table, and usually that is ok. But for problems where you have many sig figs,... more
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10/29/22

Sodium Bicarbonate as a Buffer
Show by 2 net equations how NaHCO3 may act as a buffer.
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10/28/22

A scientist dilutes 50.0 mL of a pH 5.85 solution of HCl to 1.00 L. What is the pH of the diluted solution (Kw = 1.0 × 10⁻¹⁴)?
A scientist dilutes 50.0 mL of a pH 5.85 solution of HCl to 1.00 L. What is the pH of the diluted solution (Kw = 1.0 × 10⁻¹⁴)?It says I also have to add the H^+ from the water into my calculation... more
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