05/22/24

This question concerns writing an equation of a base.

Sodium carbonate is an important industrial base, even though it contains no hydroxide anion. Write an equation that demonstrates the character of sodium carbonate as a base.
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05/20/24

This question concerns vapor pressure lowering.

Why is the vapor pressure of an aqueous solution of calcium chloride lower than the vapor pressure of water?
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05/20/24

This question concerns freezing point depression.

Aqueous solutions with a molality of 0.020 m are prepared from Na3PO4, KCl, C6H12O6, and CaCl2. Determine the expected freezing point of each solution.
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05/20/24

This question concerns freezing point depression.

Predict the freezing point of a solution of 456 g ethanol and 75.0 g KCl.
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05/20/24

This question concerns freezing point depression.

Predict the freezing point of a solution of 155 g LiCl in 575 g water.
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05/20/24

This question concerns boiling point elevation.

Determine the boiling point of a solution formed by dissolving 0.4000 kg of table sugar, C12H22O11, in 1.100 L of water.
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05/20/24

This question concerns stoichiometry.

If 17.5 L of methane, CH4, combust completely with excess oxygen at STP, determine the volumes of each of the products form.
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05/20/24

This questions concerns stoichiometry and the percent yield.

The process of coal gasification is used to convert coal, which is pure carbon, into methane gas according to the following reaction: 2C(s) + 2H2O(l) yields CH4(g) + CO2(g). If the reaction has 82%... more
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05/16/24

My question concerns freezing point depression and boiling point elevation.

Determine the molar concentration of a glycerol and water solution for boiling points of 101.75 degrees C, 100.99 degrees C, and 103.17 degrees C.  
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05/16/24

This question concerns freezing point depression and boiling point elevation.

The specific gravity of a substance is defined as the ratio of the substance's density to the density of water. For example, a substance with a specific gravity of 0.750 is 75.0% as dense as water,... more
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05/16/24

Calculate the pH and pOH of aqueous solutions having the following ion concentrations.
a) [OH-] = 3.0 ✕ 10-6 M pOH =  pH =  (b) [OH-] = 6.1 ✕ 10-4 M pOH =  pH =  (c) [H+] = 3.8 ✕ 10-9 M pOH =  pH =  (d) [H+] = 0.027 M pOH =  pH = 
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05/16/24

Calculate the pH of solutions having the following ion concentrations at 298 K.
a) [H+] = 2.0 ✕ 10-2 M(b) [H+] = 2.0 ✕ 10-6 M(c) [OH-] = 7.3 ✕ 10-6 M
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05/13/24

My question concerns percent composition.

Determine the percent composition of nitroglycerine, C3H5N3O9
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05/11/24

Kinetics in gas phases
The kinetics of a gas phase reaction of the form A → Products results in a rate constant of 1.308 M⁻¹ s⁻¹. For this reaction, the initial concentration of A is 0.947 M. At what time would the... more
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05/11/24

My question concerns the stoichiometry of gases.

Solid aluminum reacts with an aqueous solution of HCl to produce an aqueous solution of AlCl3 and hydrogen gas. If 110.0 g HCl are in the solution and 25.00 g Al are added, determine the... more
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05/11/24

This question concerns the stoichiometry of gases.

Methanol, CH3OH, is also known as wood alcohol. It is manufactured by reacting carbon monoxide and hydrogen gases at high temperatures and extreme pressure. Assume 666.0 m3 CO and 1210.0 m3 H2 go... more
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05/11/24

My question concerns the stoichiometry of gases.

Nitroglycerine, C3H5N3O9, is an oily liquid at room temperature that explodes just by being jostled too much. When it explodes, the following reaction occurs: 4C3H5N3O9(l) yields 10H2O(g) +... more
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05/11/24

My question concerns the electromagnetic spectrum.
Determine the wavelength of a photon with an energy of 3.20 x 10 to the -18th power J, and state what part of the electromagnetic spectrum it is in. 
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05/10/24

What is the pH of a 0.0380 M solution of HONH₃Cl (Kb of HONH₂ is 1.1 × 10⁻⁸)?
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05/09/24

My question concerns Dalton's law of partial pressures.
In a sample of 2.55 g of propane, C3H8, is collected in a container at a pressure of 2.55 bar. In a separate container 1.01 g of methane, CH4, are collected. the two gases are then combined into... more
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05/08/24

Determine the mass of NaCl and sodium chloride
Part 1. A chemist reacted 12.0 liters of F2 gas with NaCl in the laboratory to form Cl2 gas and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and... more
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05/07/24

What is the solubility of Cr(OH)₃ at a pH of 10.10? (Ksp Cr(OH)₃ is 6.70 × 10⁻³¹)
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05/07/24

What is the solubility of PbF₂ in a solution that contains 0.0850 M F⁻ ions? (Ksp of PbF₂ is 3.60 × 10⁻⁸)
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05/07/24

What is the solubility of La(IO₃)₃ in a solution that contains 0.150 M IO₃⁻ ions? (Ksp of La(IO₃)₃ is 7.5 × 10⁻¹²)
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05/07/24

Finding the quantity of heat

What quantity of heat, in kJ, is required to convert 17.0 g of ethanol (C₂H₅OH) at 23.0 °C to a vapor at 78.3 °C (its boiling point)? (specific heat capacity of ethanol = 2.46 J/g • °C; ∆Hvap =... more
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