11/03/19

Calculate the concentration (in M) of NO3- in a solution prepared by dissolving 84.2 g Al(NO3)3 in water to prepare 456 mL of solution.
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11/03/19

A 36.9 mL sample of solution contains 10.5 g MgBr2. If the solution is 17.7% MgBr2 by mass, what is the density of the solution (in g/mL)?
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11/03/19

Calculate Delta G of a rxn
A=387.7  B= -609.4  C= 402.0     delta Gf (Kj/mol)Use the data given in the table to calculate the value of  delta G rxn at  25 C for the reaction described by the equation A + B---><---- Cin... more
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11/02/19

Chemistry Math Question

If equal volumes of 0.28 M acetic acid and 0.18 M sodium hydroxide are mixed, what is the pH of the resulting solution? The pKa of acetic acid is 4.75
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11/02/19

Chemistry Math Question

100.0 mL of a .40 M solution of unknown weak acid is combined with 50 ml of a .25 M strong base, and the final pH of the solution is measured to be 5.25. What is the pKa of the unknown acid?
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11/02/19

Chemistry Math Question
In a 0.05 M solution of chlorous acid, what percentage of the acid is ionized to the clorous anion, ClO2-? Ka = 1.1 x 10-2
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11/02/19

Chemistry Math Problem

Calculate the percentage of acetic acid that exists in ionized form when dissolved in water at 0.65 M total concentration. Ka(HOAc) = 1.76 x 10-5.
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11/02/19

Chemistry Solubility Math Question 9
How many mg of CuNO3 can be dissolved in 124.0 mL of 1E-2 M RbBr before a precipitate forms? Ksp(CuBr)=4.2x10-8
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11/02/19

Chemistry Solubility Math Question 8
Compute the solubility of Mg(OH)2 in a buffer solution at pH=10.93. The solubility product of magnesium hydroxide is 1.2E-11
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11/02/19

Chemistry Solubility Math Question 4
If 401.0 mg of AgBr is completely dissolved in 118.0 mL of 0.07 M NH3, what is the equilibrium concentration of Ag+(aq) in the final solution? Kf[Ag(NH3)2+] = 1.7E7
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11/02/19

Chemistry Solubility Math Question 3
A pipette is used to add 49 mL of 0.4 M Pb(NO3)2 to a 273.0 mL solution of 0.2 M NaF. Determine the equilibrium concentration of Pb2+(aq) in the final solution. Ksp(PbF2)=3.6E-8
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11/02/19

Chemistry Solubility Math Question 2
How much potassium oxalate can be added to 90 mL of 0.4 M [Cu(NH3)4]Cl2 before a precipitate of CuC2O4 begins to form? Ksp(CuC2O4)=2.9x10-8 and Kf(Cu(NH3)42+)=1.1x1012
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11/02/19

Chemistry Solubility Math Question

A saturated solution of unknown metal hydroxide M(OH)2 has a measured pH of 8.93. Determine the value of Ksp for the compound.
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11/01/19

If the equilibrium constant of a given reaction is 2.54, what is the equilibrium constant of its reverse reaction?
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11/01/19

For the reaction below the partial pressure of NO₂ is 0.25 atm and the partial pressure of N₂O₄ is 1.0 atm. What is the Q of the reaction? 2 NO₂ (g) ⇌ N₂O₄ (g) Kp = 0.25
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11/01/19

The equilibrium constant for the reaction 2 HF (g) ⇌ H₂ (g) + F₂ (g) is 0.210 at a particular temperature. What is the equilibrium constant for the equation ½ H₂ (g) + ½ F₂ (g) ⇌ HF (g)?
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11/01/19

2 HI (g) ⇌ H₂ (g) + I₂ (g) At equilibrium, the partial pressure of HI is 1.9 atm and the partial pressures of H₂ and I₂ are 7.9 and 2.3 respectively. What is Kp for this equilibrium?
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10/31/19

Double Displacement Reaction Calculations
In our lab we completed conductometric titrations of FeCl3·6H2O + NaOH and CuCl2·2H2O + NaOH.My question that has two parts:1- If you could manipulate individual molecules and knew that you had 36... more
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10/31/19

A 569 mL NaCl solution is diluted to a volume of 1.11 L and a concentration of 6.00 M . What was the initial concentration C1?
Express your answer with the appropriate units.
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10/31/19

What is the final volume V2 in milliliters when 0.860 L of a 42.0 % (m/v) solution is diluted to 23.4 % (m/v)?
Express your answer with the appropriate units.
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10/31/19

Find the empirical formula for an ore that analyzes for 11.89 g of Fe for 16.99 g of of the ore, FexOy
I pretty much understand this problem, I'm just having trouble getting the mole ratio. Can someone please do this problem for me with showing all the work so I can understand please? Thank you! I... more
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10/30/19

Specific Heat of Unknown Metal Sample
An irregular lump of an unknown metal has a measured density of 5.25 g/mL. The metal is heated to a temperature of 167 °C and placed in a graduated cylinder filled with 25.0 mL of water at 25.0 °C.... more
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10/30/19

Specific Heat in cal/g*degreesC
A metal object with mass 27.5g is heated to 97.0 degrees Celsius and then transferred to an insulated container containing 84.4g of water at 20.5 degrees Celsius.  The water temperature rises and... more
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10/30/19

How many moles of product can we make from adding in 3.4 moles of H2? N2 + 3H2 --> 2NH3
a 3.4 mol b 5.1 mol c 1.2 mol d 2.3 mol
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10/30/19

Reacting one mole of sodium bicarbonate produces one mole of CO2 (g). Therefore, the mole ratio is 1mol sodium bicarbonate: 1 mol CO2. How many moles of CO2 are produced from one Alka-Seltzer tablet?
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