11/07/22

endothermic or exothermic?
C2H5OH(l) → C2H5OH(g)Br2(l) → Br2(s)C5H12(g) + 8O2(g) → 5CO2(g) + 6H2O(l)NH3(g) → NH3(l)NaCl(s) → NaCl(l)
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11/07/22

Calculate the molarity of  Cl−  anions in the chemist's solution.Be sure your answer is rounded to the correct number of significant digits.
A chemist prepares a solution of vanadiumIII chloride VCl3 by measuring out 9.6mg of VCl3 into a 50.mL volumetric flask and filling to the mark with distilled water.Calculate the molarity... more
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11/07/22

For the chemical reaction 2AgNO3+Na2CrO4⟶Ag2CrO4+2NaNO3 how many moles of silver chromate will be produced from 144 g of silver nitrate?
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11/06/22

Calculate the [H+] and pH of a 0.0045 M acetic acid solution. The 𝐾a of acetic acid is 1.76×10−5
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11/05/22

At 25∘C phosphoric acid, H3PO4, has the following equilibrium constants:
H3PO4(aq) + H2O(l) ⇌ H3O+(aq) + H2PO4-(aq) Ka1 = 7.5 x 10-3H2PO4-(aq) + H2O(l) ⇌ H3O+(aq) + HPO42-(aq) Ka2 = 6.2 x 10-8HPO42-(aq) + H2O(l) ⇌ H3O+(aq) + PO43-(aq) Ka3 = 4.2 x... more
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11/05/22

Find the PH solution of dimethylamine

Kb of dimethylamine [(CH3)2NH] is 5.90x10–4 at 25°C. Calculate the pH of a 0.0140 M  solution of dimethylamine.
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11/05/22

What is the pH at the equivalence point in the titration of 100.0 mL of 0.0500M HOCl (Ka=3.5×10−8) ( K a = 3.5 × 10 − 8 ) with 0.450M NaOH?

What is the pH at the equivalence point in the titration of 100.0 mL of 0.0500M HOCl (Ka=3.5×10−8)(Ka=3.5×10−8) with 0.450M NaOH? Express your answer to two decimal places.
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11/05/22

The specific heat of a certain type of metal is 0.128 J/(g⋅∘C). What is the final temperature if 305 J of heat is added to 37.7 g of this metal, initially at 20.0 ∘C?
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11/05/22

A 44.69 g sample of a substance is initially at 21.0 °C. After absorbing 2901 J of heat, the temperature of the substance is 120.4 °C. What is the specific heat ( 𝑐 ) of the substance?
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11/05/22

The specific heat of a certain type of cooking oil is 1.75 J/(g⋅°C). How much heat energy is needed to raise the temperature of 2.68 kg of this oil from 23 °C to 191 °C?
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11/05/22

Neutralization and Concentration
Write the balanced neutralization reaction that occurs between H2SO4 and KOH in aqueous solution. Phases are optional.neutralization reaction: _______Suppose 0.550 L of 0.500 M H2SO4 is mixed with... more
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11/05/22

A titration is preformed to find the concentration of the H2SO4. 48.67mL of an unknown sulfuric acid and 80.33mL of 0.36M KOH. What is the concentration of the sulfuric acid solution?
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11/04/22

Can you please help me solve this Chemistry problem!?
How many atoms of mercury are required to produce 3.49 L of H2 gas (density= 0.0899 g/L) according to the balanced chemical reaction. 2 Hg (l) + 2 HNO3 (aq) --> Hg2(NO3)2 (aq) + H2 (g)
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11/04/22

Chemistry matching
Match the following (Use NUMBERS and LETTERS). Note that a LETTER may be used more than once (use upper case). 1. AgNO3+ NaCl --> AgCl + NaNO32. BaCO3 ---> + Ba0 + CO23. C3H60 + 402 -- >... more
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11/04/22

Graham's law question
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found... more
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11/04/22

What is the wavelength (in nm) of a photon if the energy is 7.13 × 10⁻¹⁹ J?
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11/04/22

Wavelength Chemistry Question
For a He⁺, calculate the wavelength of light (in m) that would be emitted for the orbital transition of n(initial) = 2 to n(final) = 1.
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11/04/22

Partial Pressure
A 9.60 L9.60 L container holds a mixture of two gases at 21 °C.21 °C. The partial pressures of gas A and gas B, respectively,... more
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11/03/22

Given the thermochemical equation for photosynthesis, 6H2O(l) + 6CO2(g) → C6H12O6(s) + 6O2(g) ΔH = +2803 kJ/mol
Calculate the solar energy required to produce 8492 g of C6H12O6.
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11/03/22

What is the Ka?
If the pH of an acid is 2.3 when it has been titrated to 1/2 of the equivalence point, what is its Ka?
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11/03/22

rates of decay reactions: half life & #3 is carbon dating.
1)Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9 hours. How much time is required for the activity of a sample of thallium-201 to fall... more
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11/03/22

Use K and initial concentrations to calculate equilibrium concentrations
Consider the equilibrium system involving the decomposition of hydrogen iodide. 2HI(g) H2(g) + I2(g)     K =  [H2] [I2]  = 2.68×10-2 at 1140 K [HI]2 A flask originally... more
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11/03/22

K from [initial] and one [equilibrium]
1)A student ran the following reaction in the laboratory at 756 K:N2(g) + 3H2(g) 2NH3(g)When she introduced 3.19×10-2 moles of N2(g) and 6.91×10-2 moles of H2(g) into a 1.00 liter container, she... more
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11/03/22

equilibrium calculations with partial pressures and kp
A student ran the following reaction in the laboratory at 651 K:2NH3(g) N2(g) + 3H2(g)When she introduced NH3(g) at a pressure of 1.07 atm into a 1.00 L evacuated container, she found the... more
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11/03/22

Predict and calculate the effect of concentration changes on an equilibrium system.
Some (CH3)2CHOH is allowed to dissociate into (CH3)2CO and H2 at 452 K. At equilibrium, [(CH3)2CHOH] = 0.244 M, and [(CH3)2CO] = [H2] = 5.41×10-2 M. Additional (CH3)2CO is added so that... more
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