12/01/22

Consider a general reaction A(aq)⥫enzyme⥬B(aq)
The Δ𝐺°′ of the reaction is −9.660 kJ·mol−1. Calculate the equilibrium constant for the reaction at 25 °C.What is Δ𝐺 for the reaction at body temperature (37.0 °C) if the concentration of A... more
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12/01/22

At a certain temperature, the equilibrium constant, 𝐾c, for this reaction is 53.3.
H2(g)+I2(g)↽−−⇀2HI(g) 𝐾c=53.3At this temperature, 0.800 mol H2 and 0.800 mol I2 were placed in a 1.00 L container to react. What concentration of HI is present at equilibrium?
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12/01/22

[H+]=0.0039 M ; [CHO−2]=0.0039 M ; and [HCHO2]=0.0845 M. HCHO2(aq)↽−−⇀H+(aq)+CHO−2(aq) HCHO 2 ⁢ ( aq ) ⁢ ↽ − − ⇀ ⁢ H + ⁡ ( aq ) + CHO 2 − ⁢ ( aq )

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12/01/22

Write the equilibrium-constant expression for the reaction shown in terms of [NO] , [O2] , and [NO2] . 2NO(g)+O2(g)↽−−⇀2NO2(g) 2 NO ( g ) + O 2 ⁡ ( g ) ⁢ ↽ − − ⇀ ⁢ 2 ⁢ NO 2 ⁢ ( g )

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12/01/22

Write the equilibrium-constant expression for the reaction shown in terms of [A], [B], [C], and [D]. 3A(g)+B(g)↽−−⇀2C(g)+2D(g) 3 A ( g ) + B ( g ) ⁢ ↽ − − ⇀ ⁢ 2 C ( g ) + 2 D ( g )

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11/30/22

Chemistry Titration
Calculate the pH when 82.5 mL of 0.200 M HBr is mixed with 30.0 mL of 0.400 M CH₃NH₂ (Kb = 4.4 × 10⁻⁴).
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11/30/22

Chemistry Titration
In a titration of 72.0 mL of a 0.500 M solution of a diprotic acid H₂C₃H₂O₄ (malonic acid) with 0.255 M NaOH, how many mL of the base are required to reach the first equivalence point?
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11/30/22

Complete and balance the following redox reaction in basic solution.
Complete and balance the following redox reaction in a basic solution. Be sure to include the proper phases for all species within the reaction.TeO₃²⁻(aq) + As(s) → Te(s) + H₂AsO₄⁻(aq)
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11/30/22

Chemistry bundle review

How many moles are in 4.00x10^2 gram of Cesium iodide? How many moles are in 8.76x10^12 molecules of CH4?
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11/30/22

Gravimetry in Analytical Chemistry
What volume (mL) of 0.2000 M (NH4)2HPO4 is necessary to precipitate the calcium as Ca3(PO4)2 from 800.0 mg of a sample that contains 10.00% w/w Ca?
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11/30/22

Chemistry bundle 2 review
How many atoms of C in 2.00moles of C6H12O6
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11/30/22

How many calories of heat must be added to raise the temperature of 40 g of water from 25 to 300C?
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11/30/22

Why can't the Ka of the acid be determined at the midpoint in the titration of a strong acid with a strong base?
Why can't the Ka of the acid be determined at the midpoint in the titration of a strong acid with a strong base?options given:a)the number of moles of strong acid is unknownb)the Ka of the strong... more
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11/30/22

Would the ph be 10.89 at equivalence or after equivalence?
An analytical chemist is titrating 241.3mL of a 0.07900M solution of ethylamine C2H5NH2 with a 0.8500M solution of HIO3. The pKb of ethylamine is 3.19. Calculate the pH of the base solution after... more
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11/29/22

A 25.0 mL solution of HBr is neutralized with 22.6 mL of 0.105 M Sr(OH)₂. What is the concentration of the original HBr solution?
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11/29/22

Consider the reaction N2(g)+O2(g)↽−−⇀2NO(g) N 2 ( g ) + O 2 ( g ) ↽ − − ⇀ 2 NO ( g ) that has an equilibrium constant, 𝐾c K c , fof 4.10×10−4 4.10 × 10 − 4 at 1700 1700 °C.
What percentage of O2 O 2 will react to form NO if 0.883 0.883 mol N2 N 2 and 0.883 0.883 mol O2 O 2 are added to a 0.605 0.605 L container and allowed to come to equilbrium at ... more
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11/29/22

Write an equation for the dissolution of the given solutes in water.
A. HCl (aq) B. NH4OH (aq) C. C2H5OH (aq)
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11/29/22

Chem 101 problem, please help I just can’t figure it out
What volume in mL of CO gas at STP are required to produce 10.4g of CH3COOH via a carbonylation reaction with excess CH3OH (methanol) CO(g) + CH3OH(l) = CH3COOH(l)
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11/28/22

Solid CO2 (dry ice) sublimes at 195 K and its heat of sublimation ΔHsubl = 25.2 kJ/mol.

A block of dry ice with a mass of 23.6 g sublimes. What is the entropy change, ΔS, of the CO2? (Enter your answer in J/K).**Heat is equal to T * &DeltaS. Be sure the units are correct.
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11/28/22

I wanna know how to do this problem I am lost
An aqueous potassium carbonate solution is made by dissolving 6.286.28 moles of K2CO3K2CO3 in sufficient water so that the final volume of the solution is 4.80 L4.80 L. Calculate the molarity of... more
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11/28/22

A sample of gas has an initial volume of 22.2 L at a pressure of 1.57 atm. If the sample is compressed to a volume of 10.2 L , what is its pressure? (Assume constant temperature.)
Please explain thoroughly
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11/28/22

What is the minimum number of fuel canisters you must bring?The standard heat of formation of propane at  25°C  is −103.8/kJmol
On a 12 day wilderness expedition you'll need to heat 5.0kg of water to the boiling point each day. The air temperature will average 25°C. You have available canisters of compressed... more
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11/28/22

A metal with a specific heat of 0.780J/g c requires 45.0 J of heat to raise the temperature by 2.00 c what is the mass of the metal
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11/28/22

balance the following redox reaction in acidic solution

Complete and balance the following redox reaction in acidic solutionMnO₄⁻(aq) + S₂O₃²⁻(aq) → S₄O₆²⁻(aq) + Mn²⁺(aq)
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11/28/22

Balance the following redox reaction in basic solution
Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction.Zn(s) → Zn(OH)₄²⁻(aq) + H₂(g)
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