J.R. S.

02/09/21

A 5.76 liter sample of gas at 22.00C and 748 atm pressure was heated to a final volume of 17.28 liters, with the pressure remaining constant. What was the final Celsius temperature?

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Answers •1

02/08/21

CHEMISTRY HELP PLEASE

How many liters of hydrogen gas at STP can be generated from the reaction of excess hydrogen chloride with 67.3 g of aluminum?

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Chemistry

02/08/21

A reactant decomposes with a half-life of 187 s when its initial concentration is 0.269 M.

When the initial concentration is 0.577 M, this same reactant decomposes with the same half-life of 187 s. What is the order of the reaction? What is the value and unit of the rate constant for... more

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Science Chemistry

02/08/21

Calculate the boiling point (in oC) of an aqueous solution which is 0.126 m in potassium carbonate.

Kb = 0.52 oC/m

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Science Chemistry Chem

02/08/21

Which of the following solutions would have the lowest freezing point?

a. 0.10 M lithium chlorideb. 0.15 M barium nitratec. 0.20 M potassium iodided. 0.25 M sodium nitratee. 0.20 M calcium bromide

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Chemistry

02/08/21

Unit Conversion

In France, grapes are 1.65 euros per kilogram. What is the cost of grapes in dollars per pound if the exchange rate is 1.35 dollars per euro?

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Chemistry

02/08/21

A solution consists of 0.695 moles of C7H8 and 0.600 moles of C6H12. What is the mole fraction of C7H8 in the vapor above this solution at 25oC?

A solution consists of 0.695 moles of toluene (C7H8) and 0.600 moles of cyclohexane (C6H12). The vapor pressures of toluene and cyclohexane at 25oC are 28.4 mmHg and 107.5 mmHg, respectively. What... more

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Chemistry

02/08/21

If you were performing a fractional distillation, which of the following compounds would exit the top of the distillation column first?

A.)C11H24B.)C3H8C.)C5H12D.)C9H20E.) C7H16

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Chemistry

02/08/21

The solubility of a compound in water is found to be 7.26 grams per 100.0 grams of water at 25oC. Calculate the molality of the compound in a saturated aqueous solution at 25oC

The solubility of a compound (molar mass = 175 g/mol) in water is found to be 7.26 grams per 100.0 grams of water at 25oC. Calculate the molality of the compound in a saturated aqueous solution at... more

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Chemistry

02/08/21

What is the molality of ions in a 0.573 m solution of (NH₄)₃PO₄ assuming the compound dissociates completely?

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Chemistry

02/07/21

Determine Rate Law: Initial Rates

The following initial rate data are for the oxidation of nitrogen monoxide by oxygen at 25 oC:2 NO + O22 NO2 Experiment [NO]o, M [O2]o, M Initial Rate, M... more

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Chemistry Physiology

02/07/21

Are hydrogen bonds a type of covalent bond?

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Chemistry

02/07/21

The vapor pressure of water at 20°C is 17.54 torr. What is the vapor pressure (in torr)of a solution containing 143.8g of dextrose (C6H12O6 ) and 146.5 g of water at ?

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Chemistry

02/07/21

A 37.14 g sample of a substance is initially at 23.0 °C. After absorbing 1479 J of heat, the temperature of the substance is 125.6 °C. What is the specific heat ( 𝑐 ) of the substance?

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Chemistry

02/07/21

After 43.0 min, 15.0% of a compound has decomposed. What is the half‑life of this reaction assuming first‑order kinetics?

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Chemistry

02/07/21

What is the specific heat of titanium in J/g°C if it takes 99.7 J to raise the temperature of a 34.7 g block by 5.20°C?

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Chemistry

02/07/21

What is the molality of ions in a 0.479 m solution of SrCl₂ assuming the compound dissociates completely?

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Answers •1

Chemistry

02/06/21

2NO(g) + Br2(g) // 2NOBr(g)

Consider the equilibrium system described by the chemical reaction below. For this reaction, Kp = 109 at 298 K. If the equilibrium partial pressures of Br₂ and NOBr at 0.0159 atm and 0.0768 atm,... more

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Chemistry

02/06/21

N2(g) + 3H2(g) // 2NH3(g)

Consider the equilibrium system described by the chemical reaction below. For this reaction, Kp = 4.51 × 10⁻⁶ at a particular temperature. Calculate the value of Qp for the initial set reaction... more

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Chemistry

02/06/21

4Fe(s) + 3O2(g) // 2Fe2O3(s)

Consider the equilibrium system described by the chemical reaction below. At equilibrium, a 2.0 L reaction vessel contained a mixture of 1.0 mol Fe, 1.0 × 10⁻³ mol O₂, and 2.0 mol of Fe₂O₃ at 2000... more

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Chemistry

02/06/21

CH4(g) + H2O(g) // CO(g) + 3H2(g)

Consider the equilibrium system described by the chemical reaction below. At equilibrium, a sample of gas from the system is collected into 5.00 L flask. The flask is found to contain 8.62 g of CO,... more

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Chemistry

02/06/21

Construct the expression for Kp for the following reaction. (31)

2C2H4(g) + 2H2O(g) // 2C2H6(g) + O2(g)Kp =

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Chemistry

02/06/21

AlCl₃ has a van't Hoff factor of i = 3.20. What is the concentration of particles in a 0.551 M solution of AlCl₃?

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Answers •1

Chemistry

02/05/21

Thermochemical Stoichiometry

The following thermochemical equation is for the reaction of hydrogen bromide(g) with chlorine(g) to form hydrogen chloride(g) and bromine(g). 2HBr(g) + Cl2(g)2HCl(g) + Br2(g) H... more

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Chemistry

02/05/21

Chemistry Stoichiometry

How many milligrams of oxygen are required to create 5.14 liters of carbon dioxide gas at STP from the complete combustion of methane (CH4)? Must be in scientific notation

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Answers •1

A 5.76 liter sample of gas at 22.00C and 748 atm pressure was heated to a final volume of 17.28 liters, with the pressure remaining constant. What was the final Celsius temperature?

CHEMISTRY HELP PLEASE

A reactant decomposes with a half-life of 187 s when its initial concentration is 0.269 M.

Calculate the boiling point (in oC) of an aqueous solution which is 0.126 m in potassium carbonate.

Which of the following solutions would have the lowest freezing point?

Unit Conversion

A solution consists of 0.695 moles of C7H8 and 0.600 moles of C6H12. What is the mole fraction of C7H8 in the vapor above this solution at 25oC?

If you were performing a fractional distillation, which of the following compounds would exit the top of the distillation column first?

The solubility of a compound in water is found to be 7.26 grams per 100.0 grams of water at 25oC. Calculate the molality of the compound in a saturated aqueous solution at 25oC

What is the molality of ions in a 0.573 m solution of (NH₄)₃PO₄ assuming the compound dissociates completely?

Determine Rate Law: Initial Rates

Are hydrogen bonds a type of covalent bond?

The vapor pressure of water at 20°C is 17.54 torr. What is the vapor pressure (in torr)of a solution containing 143.8g of dextrose (C6H12O6 ) and 146.5 g of water at ?

A 37.14 g sample of a substance is initially at 23.0 °C. After absorbing 1479 J of heat, the temperature of the substance is 125.6 °C. What is the specific heat ( 𝑐 ) of the substance?

After 43.0 min, 15.0% of a compound has decomposed. What is the half‑life of this reaction assuming first‑order kinetics?

What is the specific heat of titanium in J/g°C if it takes 99.7 J to raise the temperature of a 34.7 g block by 5.20°C?

What is the molality of ions in a 0.479 m solution of SrCl₂ assuming the compound dissociates completely?

2NO(g) + Br2(g) // 2NOBr(g)

N2(g) + 3H2(g) // 2NH3(g)

4Fe(s) + 3O2(g) // 2Fe2O3(s)

CH4(g) + H2O(g) // CO(g) + 3H2(g)

Construct the expression for Kp for the following reaction. (31)

AlCl₃ has a van't Hoff factor of i = 3.20. What is the concentration of particles in a 0.551 M solution of AlCl₃?

Thermochemical Stoichiometry

Chemistry Stoichiometry

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