25,963 Answered Questions for the topic chemistry

Chemistry

03/03/24

Dilution of Chemical Equations
A chemist makes 460.mL of aluminum sulfate Al2SO43 working solution by adding distilled water to 160.mL of a 0.300M stock solution of aluminum sulfate in water.Calculate the concentration of the... more
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Chemistry

03/03/24

Solving for a reactant in solution
One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(II) carbonate, in concentrated sulfuric acid. The sulfuric acid reacts with the... more
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Chemistry

03/02/24

Given the following reaction: 4H2O(g) + 3Fe(s)  Fe3O4(s) + 4H2(g)
How much iron( in grams) is need to produce enough hydrogen gas to fill a 17.8 L tank at 34.0oC and 815 torr?
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Chemistry

03/02/24

Using the Kf and Kb equations with electrolytes

A certain liquid X has a normal freezing point of 7.40°C and a freezing point depression constant Kf=2.41°C•kf•mol^-1.A solution is prepared by dissolving some ammonium sulfate((NH4)2SO4) in 700.g... more
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Chemistry

03/02/24

Using the Kf and Kb equations with electrolytes

The normal freezing point of a certain liquid X is 4.00°C, but when 63.7 g of barium hydroxide(Ba(OH)2) are dissolved in 600.g of X the solution freezes at 2.8°C instead. Use this information to... more
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Chemistry

03/02/24

Reaction Mechanisms

Consider the following elementary steps. Step 1: A  ⇌ C (--> is k1, <--- is k-1) Step 2: C+B --> D (--> is k2)Assume that both reaction have similar rates. That is, no... more
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Chemistry

03/02/24

Reaction Mechanisms
18) Consider the following elementary steps Step 1: (fast) A + B ⇌ C + D (--> is k1, <-- is k-1)Step 2: (slow) C + B --> D (--> is k2)What is the overall rate law?I don't... more
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Chemistry

03/02/24

Solving for a reactant in solution
One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chloride anions in solution will combine... more
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Chemistry

03/02/24

Using molarity to find solute moles and solution volume
Calculate the volume in liters of a 3.29 x 10^−4 mol/L magnesium fluoride solution that contains 175.g of magnesium fluoride MgF2. Be sure your answer has the correct number of significant digits.
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Chemistry

03/02/24

Using molarity to find solute moles and solution volume
Calculate the volume in liters of a 0.299/molL barium acetate solution that contains 475.mmol of barium acetate BaC2H3O22. Be sure your answer has the correct number of significant digits.
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Chemistry

03/02/24

Dilution of Chemical Reactions
A chemist must prepare 750.mL of 2.00M aqueous potassium iodide KI working solution. She'll do this by pouring out some 2.91molL aqueous potassium iodide stock solution into a graduated cylinder... more
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Chemistry

03/01/24

Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are PPCl5 = 0.5000 atm and PPCl3 = 0.5050 atm.
For the reaction below, Kp = 25.1 at 800 K.PCl5​(g)PCl3​(g)+Cl2​(g)Calculate the equilibrium partial pressures of the reactants and products if the initial pressures are PPCl5 = 0.5000 atm and... more
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Chemistry

03/01/24

Determine the equilibrium concentration of H2O if the starting concentrations of both reactants are 0.003923 M, with [HOCl]o = 0.000 M.
The value of Kc for the reaction between water vapor and dichlorine monoxide is 0.0900 at 25°C.H2​O(g)+Cl2​O(g)2HOCl(g)a. Determine the equilibrium concentration of H2O if the... more
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Chemistry

03/01/24

Calculating Volume of Chemical equations
A chemistry student weighs out 0.0939g of phosphoric acid H3PO4, a triprotic acid, into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid... more
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Chemistry

03/01/24

Using molarity to find solute moles and solution volume Problem PageQuestion
A chemist adds 1.10L of a 0.74M aluminum chloride AlCl3 solution to a reaction flask. Calculate the millimoles of aluminum chloride the chemist has added to the flask. Be sure your answer has the... more
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Chemistry

03/01/24

Dilution of Chemical Equations
A chemist must dilute 46.7mL of 42.2μM aqueous zinc oxalate ZnC2O4 solution until the concentration falls to 16.0μM. He'll do this by adding distilled water to the solution until it reaches a... more
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Chemistry

02/29/24

What is the partial pressure of HCl?
Calculate the partial pressure (in atm) of HCl at equilibrium when 22.9 g of NH4Cl decomposes at 650 K according to the following chemical equation:NH4Cl(s) ⇌ NH3(g) + HCl(g)Kp = 7.95
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Chemistry

02/29/24

an aqueous solution is 0.40 mole fraction solution of methanol in water complete the table and calculate m
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Chemistry

02/29/24

Energy Transfer
What is the change in temperature if 90 grams of steam releases 945 calories of energy
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Chemistry

02/29/24

Energy Transfer
What is the change in temperature if 90 grams of steam releases 945 calories of energy
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Chemistry

02/29/24

How to solve this?
Vitamin C (ascorbic acid, C₆H₈O₆, 176.12 g/mol) can be measured by redox titration with iodine solution. Iodine is reduced to iodide ion, while ascorbic acid is oxidized to dehydroascorbic acid... more
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Chemistry

02/29/24

Using molarity to find solute moles and solution volume
Calculate the volume in milliliters of a 0.724M aluminum sulfate solution that contains 75.0mmol of aluminum sulfate Al2SO43. Be sure your answer has the correct number of significant digits.
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Chemistry

02/29/24

Dilution of Chemical Reactions
A chemist makes 870.mL of silver nitrate AgNO3 working solution by adding distilled water to 160.mL of a 1.92molL stock solution of silver nitrate in water.Calculate the concentration of the... more
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Chemistry

02/29/24

How many milligrams of a 24 mg sample of cesium-137 remain after 120 years?
How many milligrams of a 24 mgmg sample of cesium-137 remain after 120 years?
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Chemistry

02/29/24

If 21.35 mL of 0.005 M iodine solution is needed to titrate a solution of commercial vitamin C tablet (500 mg) prepared in a 100-ml volumetric flash, then what is the mass % of the vitamin C?
If 21.35 mL of 0.005 M iodine solution is needed to titrate a solution of commercial vitamin C tablet (500 mg) prepared in a 100-ml volumetric flash, then what is the mass % of the vitamin C?
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