25,963 Answered Questions for the topic chemistry

Chemistry

11/09/23

What is the value of K in this equilibrium?
At equilibrium, an aqueous solution of formic acid (HCHO2) has these concentrations: [H+] =0.0067 M;[CHO2-]= 0.0067 M; and [HCHO2]=0.249HCHO2(aq) ⇌ H+ (aq) +CHO2- (aq)What is the value of K in this... more
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Chemistry Biochemistry

11/08/23

basic biochemical calculation
What is the maximal volume of CO2 (at normal conditions) which can be produced if the following reagents are available? a) 1.00 kg of 5.0% hydrochloric acid and 200 g of limestone containing 90% of... more
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Chemistry Biochemistry

11/08/23

biochemical calculations
We have the solution of calcium chloride. The sodium carbonate was added to this solution, which resulted in precipitation of calcium carbonate. this precipitate was then calcinated, and at the end... more
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Chemistry

11/08/23

Electrochemical cell notation, cell potential

The anode half reaction of the cell is : Pb(s) + 2Cl^- <<<<>>> PbCl2 + 2eCathode half reaction: Ag(s) + 2e <<<<>>> 2AgCl(s) + 2Cl-( it wants me to... more
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Chemistry

11/08/23

What is the value of K in this equilibrium?
At equilibrium, an aqueous solution of formic acid (HCHO2) has these concentrations: [H+] =0.0067 M; [CHO2-]= 0.0067 M; and [HCHO2]=0.249 HCHO2(aq) ⇌ H+ (aq) +CHO2- (aq)What is the value of K in... more
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Chemistry

11/08/23

What is the concentration of the reactant, PCl5 at equilibrium?
Consider the reaction. PCl5(g) ⇌ PCl3(g) +Cl2(g) K=0.042The concentration of the products at equilibrium are [PCl3] =0.13 M and [Cl2] = 0.27 M.What is the concentration of the reactant,... more
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Chemistry

11/08/23

CH3 CH CH2 CH2 Cl Cl
CH3 CH CH2 CH2 ClCl
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Chemistry

11/08/23

Calculating specific heat capacity
A chemist carefully measures the amount of heat needed to raise the temperature of a 835.0 mg sample of a pure substance from 30.2*C to 52.1*C. The experiment shows that 85.9J of heat are needed.... more
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Chemistry Math Science Biology

11/08/23

Electric Potential and Energy Storage

The plates of a certain parallel-plate capacitor have been set with a separation of d = 4.15 mm, and each has an area of A = 50 cm2. After charging the capacitor, each plate carries a full charge... more
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Chemistry

11/08/23

Determine the value of Ksp for AgIO3 by constructing an ICE table, writing the solubility constant expression and solving the expression.

It is found that up to 0.0980 g of AgIO3 dissolves in a 2.00 L of aqueous solution at a certain temperature.
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Chemistry

11/08/23

Determine the molar solubility for BaCO2 by construing an ICE table, writing the solubility constant expression, and solving for molar solubility.

Assume that the solution already contains 1.4x10^-4 M CO3^-2
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Chemistry

11/08/23

Standard potential
A galvanic cell consists of an inert platinum electrode in a solution containing 1.0 M chromium(II) ion and 1.0 M chromium(II) ion, and another inert platinum electrode in a solution containing... more
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Chemistry

11/08/23

what is the molarity

A commercial juice is known to have 140 % of the daily allowance of vitamin C per serving (220 mL). If the daily allowance of vitamin C is 75.0 mg, what is the molarity of vitamin C in this juice... more
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Chemistry

11/07/23

Calculate the molar solubility, s, of this compound.

The Ksp of tin (II) hydroxide, Sn(OH)2, is 5.45 x 10-27 .Calculate the molar solubility, s, of this compound. s= ?M
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Chemistry

11/07/23

Calculate the solubility product Ksp, for BaSO4.
The concentrations of barium and sulfate ions in a saturated aqueous solution of BaSO4 are both 1.05 x 10-5 M. Calculate the solubility product Ksp, for BaSO4.Ksp=?
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Chemistry

11/07/23

What ratio of NaCN to HCN is needed to prepare a pH 9.80 buffer? (Ka of HCN is 4.9 × 10⁻¹⁰)
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Chemistry

11/07/23

Calculate the equilibrium constant for the chemical reaction, given the equilibrium concentrations of the reactants and products in the table.

Calculate the equilibrium constant for the chemical reaction, given the equilibrium concentrations of the reactants and products in the table. Substance Equilibrium Concentration AB ... more
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Chemistry

11/07/23

Enter the solubility - product expression for Al(OH)3 (s).

Enter the solubility - product expression for Al(OH)3 (s). Ksp= ?
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Chemistry

11/07/23

You have found Ksp to be 3.4 × 10⁻¹⁰. If solid In₂(SO₄)₃ is added to a solution that already contains 0.150 M In(NO₃)₃, what will the new solubility of the solid be?
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Chemistry

11/06/23

Write the equilibrium-constant expression for the reaction shown in terms of [SO2], [CO2]. [CS2], [O2].
Write the equilibrium-constant expression for the reaction shown in terms of [SO2], [CO2]. [CS2], [O2].2 SO2 (g) + CO2 (g) ⇌ CS2 (g) + 3 O2 (g)Kc , which is sometimes symbolized as K or Keq ,... more
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Chemistry

11/06/23

If a tudent weighted out 0.625g of KHP, dissolved it in 50 mL of water and titrated it with NaOH, using phenoiphthalein to determine the endpoint

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Chemistry

11/06/23

What is the concentration of S2- in equilibrium with MnS(s) (Ksp=4.6x10-14) and 0.062 M Mn2+?

What is the concentration of S2- in equilibrium with MnS(s) (Ksp=4.6x10-14) and 0.062 M Mn2+? [S2-]=? M
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Chemistry

11/06/23

What is the activation energy of the reaction?
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Chemistry

11/06/23

Help with Energy of Phase Change
Determine the total amount of energy in J that is released when an ice cube weighing 8.0 g warms from an initial temperature of -4.70 ∘C to its melting point of 0.00 ∘C and then melts completely.... more
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Chemistry

11/06/23

calculate the mass of Ca(OH)2 in a sample if the calcium hydroxide is neutralized by 22.50mL of 0.500M HCL?
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