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Chemistry

10/10/23

balance the equation

Balance the equation Al2O3(s) + NaOH(l) --> Na3AIF6 + H20(g)

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Chemistry

10/10/23

SiO2 + 3C = SiC + 2CO; If 100 g of SiO2 and 100 g of C are reacted as far as possible, which one of the following statements will be correct?

(a) 111 g of SiO2 will be left over.(b) 44 g of SiO2 will be left over.(c) 82 g of C will be left over.(d) 40 g of C will be left over.(e) Both reactants will be consumed completely, with none of... more

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Chemistry

10/09/23

What is the pH of the solution?

Buffers resist the change in pH when small amounts of either acid or base are added. Buffers are often made from an acid and a salt of that same acid such as with methanoic acid (formic acid) and... more

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Chemistry

10/09/23

precipitation reaction of K3PO4 (aq) + MgCl2(aq)

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Chemistry

10/09/23

Using the data in the table, calculate the heat energy produced in each reaction.

Sample Mass Temperature Change( calorimeter) qreaction 1 1.015g 8.01 ∘C 2 ... more

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Chemistry

10/09/23

Write the balanced equation for the combustion of this compound.

While working for a food science company, you need to analyze the energy content of a sugar substitute with the molecular formula C5H12O5. As part of this process, you conduct a series of bomb... more

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Chemistry

10/09/23

How much heat was released by the solution? What is the enthalpy of the reaction?

Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 34.1 g of KNO3 is dissolved in 279 g of water at 23.00 °C.KNO3(s)−→−−H2OK+(aq)+NO−3(aq)The temperature... more

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Chemistry

10/09/23

Mass of precipitate formed when 3.75 L of 0.0570 M Ba(OH)2 is mixed with 3.25 L of 0.0782 M Na2SO4

When 3.75 L of 0.0570 M Ba(OH)2 is mixed with 3.25 L of 0.0782 M Na2SO4 a precipitate is formed. Write a balanced equation for this reaction (include the state of the reactants and products) and... more

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Chemistry

10/09/23

Concentration of ethanol as a mass percent.

Cask wine is available in a range of alcohol concentrations. Hardy's cask wine chardonnay contains 13.0% ethanol by volume. Calculate the concentration of ethanol as a mass percent. The density of... more

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Chemistry

10/09/23

If a gas mask contained 35.55 g of KO2 and 5.4 g of water, what amount of oxygen (in grams) could be produced?

Potassium superoxide KO2 is used in rebreathing gas masks to produce oxygen. 4KO2 + 2H2O à 4KOH + 3O2If a gas mask contained 35.55 g of KO2 and 5.4 g of water, what amount of oxygen (in grams)... more

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Chemistry

10/09/23

What is the enthalpy per mole of phenol? Express the enthalpy in kilojoules per mole to three significant digits

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Chemistry

10/08/23

1.24 g H2 is allowed to react with 9.99 g N2 , producing 1.96 g NH3 .

What is the theoretical yield in grams for this reaction under the given conditions?What is the percent yield for this reaction under the given conditions?

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Chemistry

10/08/23

How much heat was released by the solution? & What is the enthalpy of the reaction?

Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 34.1 g of KNO3 is dissolved in 279 g of water at 23.00 °C.KNO3(s)−→−−H2OK+(aq)+NO−3(aq)The temperature... more

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Chemistry

10/08/23

how much heat is produced when 22.9 g of methanol reacts with 35.5 g of oxygen?

When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released, as shown in the combustion reaction.CH3OH(g)+32O2(g)⟶CO2(g)+2H2O(l) ... more

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Chemistry

10/08/23

Given the following reaction below, how many grams of H2O (MM = 18.02 g/mol) can be formed from 7.234 grams of C12H26 (MM = 170.34 g/mol)? 2 C12H26 (g) + 37 O2 (g) → 24 CO2 (g) + 26 H2O (g)

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Chemistry

10/08/23

How much methanol, in grams, must be burned to produce 683 kJ of heat?

When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released. For this reason, it is often used as a fuel in high performance racing cars. The... more

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Chemistry

10/08/23

calculate the heat energy produced by the combustion of one kilogram of methane

Methane is the main component of natural gas. Using the given reaction enthalpy, calculate the heat energy produced by the combustion of one kilogram of methane.CH4 (g)+2O2 (g)⟶CO2 (g)+2H2O (l) ... more

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Chemistry

10/08/23

What is the heat of reaction? Δ𝐻= ? kJ/mol

Δ𝐻= ? kJ/mol

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Chemistry

10/08/23

How much methanol, in grams, must be burned to produce 683 kJ of heat?

When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released. For this reason, it is often used as a fuel in high performance racing cars. The... more

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Chemistry

10/07/23

Measurements and Error. Density, Absolute Error (precision) of Volume, Relate Error of Average Volume, Absolute error if only trial 2 was performed

A professor determined the mass of 3 pennies using a balance. He suspected that some of the pennies were made of pure copper. He decided to determine the density of a penny by measuring the mass... more

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Chemistry

10/07/23

In the laboratory you dissolve 24.9 g of aluminum sulfate in a volumetric flask and add water to a total volume of 125 . mL.

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Chemistry

10/06/23

In the laboratory a student finds that it takes 169 J to increase the temperature of 14.3 g of gaseous oxygen from 22.9 to 36.6 °C.

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Chemistry

10/06/23

Weak buffer solution titrated with a strong base

A 50.0 mL sample of buffer solution contains 0.120 M acetic acid and 0.150 M sodium acetate.If 5.55 mL of 0.092 M NaOH is added to this solution, identify the resulting number of moles of acetic... more

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Chemistry

10/06/23

Calculate the pH of the base solution after the chemist has added 5.7 mL of the HNO3 solution to it.

An analytical chemist is titrating 63.6 mL of a 0.1800M solution of diethylamine ((C2H5)2NH) with a 0.6300M solution of HNO3 The pKb of diethylamine is 2.89. Calculate the pH of the base solution... more

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Chemistry

10/06/23

Calculate the pH of the solution at equivalence.

A chemist titrates 90.0 mL of a 0.2315M pyridine (C5H5N) solution with 0.6080M HBr solution at 25 °C. Calculate the pH at equivalence. The pKb of pyridine is 8.77.Round your answer to 2 decimal... more

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balance the equation

SiO2 + 3C = SiC + 2CO; If 100 g of SiO2 and 100 g of C are reacted as far as possible, which one of the following statements will be correct?

What is the pH of the solution?

precipitation reaction of K3PO4 (aq) + MgCl2(aq)

Using the data in the table, calculate the heat energy produced in each reaction.

Write the balanced equation for the combustion of this compound.

How much heat was released by the solution? What is the enthalpy of the reaction?

Mass of precipitate formed when 3.75 L of 0.0570 M Ba(OH)2 is mixed with 3.25 L of 0.0782 M Na2SO4

Concentration of ethanol as a mass percent.

If a gas mask contained 35.55 g of KO2 and 5.4 g of water, what amount of oxygen (in grams) could be produced?

What is the enthalpy per mole of phenol? Express the enthalpy in kilojoules per mole to three significant digits

1.24 g H2 is allowed to react with 9.99 g N2 , producing 1.96 g NH3 .

How much heat was released by the solution? & What is the enthalpy of the reaction?

how much heat is produced when 22.9 g of methanol reacts with 35.5 g of oxygen?

Given the following reaction below, how many grams of H2O (MM = 18.02 g/mol) can be formed from 7.234 grams of C12H26 (MM = 170.34 g/mol)? 2 C12H26 (g) + 37 O2 (g) → 24 CO2 (g) + 26 H2O (g)

How much methanol, in grams, must be burned to produce 683 kJ of heat?

calculate the heat energy produced by the combustion of one kilogram of methane

What is the heat of reaction? Δ𝐻= ? kJ/mol

How much methanol, in grams, must be burned to produce 683 kJ of heat?

Measurements and Error. Density, Absolute Error (precision) of Volume, Relate Error of Average Volume, Absolute error if only trial 2 was performed

In the laboratory you dissolve 24.9 g of aluminum sulfate in a volumetric flask and add water to a total volume of 125 . mL.

In the laboratory a student finds that it takes 169 J to increase the temperature of 14.3 g of gaseous oxygen from 22.9 to 36.6 °C.

Weak buffer solution titrated with a strong base

Calculate the pH of the base solution after the chemist has added 5.7 mL of the HNO3 solution to it.

Calculate the pH of the solution at equivalence.

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