Joan L.

11/30/23

Enthalpy Calculations

Calculate the enthalpy of combustion (kJ/mol) of ethyl stearate (C₂₀H₄₀O₂), an important component of many biodiesel fuels made from soybean oil and ethanol, given the following standard enthalpies... more

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Chemistry

11/30/23

Standard enthalpy of formation of C8H18?

For a particular isomer of C8H18 the combustion reaction produces 5093.7 kJ of heat per mole of C8H11(g) consumed, under standard conditions.C8H18(g)+ 25/2O2(g) —> 8CO2(g) + 9H2O(g)Delta H= -... more

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Chemistry

10/25/23

The standard heat of formation for Be(OH)2(s) is -903 kJ/mol at 298 K. Write the formation equation for Be(OH)2(s) that goes with this value of ΔH°.

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Chemistry

05/16/23

a pure sample of silver has 2.79 X10^23 atoms of silver. What mass of silver is present in this sample

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Chemistry

05/16/23

If 15.9 grams of iron react with 12.8 grams of oxygen gas, how many grams of iron (III) oxide are produced? What is the limiting reactant and what is the excess reactant in this reaction?

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Chemistry

05/05/23

How I set up my class online, I already found the tutor

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Chemistry

05/02/23

What is the concentration of NO3- ions in a solution prepared by dissolving 15.0 g of Ca(NO3)2 in enough water to produce 300. mL of solution?

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Chemistry

05/01/23

Compare the gas pressure in a one-liter samples of oxygen, nitrogen, and neon, each with a mass of 2.0 g at 25 °C. Put in descending order.

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Chemistry

05/01/23

At what pressure does methane (CH₄) have a density of 17.2 g/L at 49.5 °C?

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Chemistry

04/04/23

Solve for the enthalpy change of steam reforming methane

The steam reforming of methane occurs according to the following chemical equation: CH₄(g) + 2H₂O(g) ⇌ CO₂(g) + 4H₂(g) Use the following equations to solve for the enthalpy change of steam... more

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Chemistry

03/06/23

At a certain temperature, the equilibrium constant, 𝐾, for the given reaction is 53.3. H2(g)+I2(g)↽−−⇀2HI(g)𝐾=53.3

At this temperature, the reactants were placed in a container to react. If the partial pressures of H2 and I2 were each 0.500 bar initially, what is the partial pressure of HI at equilibrium?𝑃HI=bar?

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Chemistry

02/28/23

Ideal gas calculation

Consider a sample of helium in a 5.0 liter tank with a pressure of 785 mm Hg at a temperature of 18 degree Celsius. If the gas is heated to 75 degrees Celsius, what will the pressure inside the... more

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Chemistry

02/28/23

Ideal gas calculation

Consider a sample of helium in a 5.0 liter tank with a pressure of 785 mm Hg at a temperature of 18 degree Celsius. What is the mass of the gas sample?

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Chemistry

02/28/23

What is the pressure (in atm) in a 5.00 L tank with 17.00 grams of oxygen gas at 350K

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Chemistry

02/27/23

Obtain grams of lead

Using the balanced equation 2PbS + 3O2 - 2Pb + 2SO3 how many grams of lead will be produced if 2.54 grams of PbS is burned with 1.88 g of O2? Express your answer in to the correct number of... more

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Chemistry

02/07/23

The solution contains 1.18 moles of the unknown. What is the molar mass of the unknown compound?

A solution made by dissolving 150.0 g of an unknown compound in 370.0 mL of benzene to make a solution which has a freezing point 18.6 °C lower than that of pure benzene. Kf for benzene is 5.12... more

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Chemistry

02/06/23

The molality of the solution is 3.63 m. What quantity in moles of the unknown compound were dissolved in the solution?

A solution made by dissolving 150.0 g of an unknown compound in 370.0 mL of benzene to make a solution which has a freezing point 18.6 °C lower than that of pure benzene. Kf for benzene is 5.12... more

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Chemistry

01/26/23

Use the ratio in the balanced chemical equation below to determine how many moles of sodium (Na) are required to produce 0.6 moles of sodium oxide (Na2O).

4 Na + O2 → 2 Na2O

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Chemistry

12/06/22

How many grams Ir2O3 (MW = 432 g/mol) are produced from 199 grams IrCl3 (MW = 299 g/mol)?

Given the following reaction: IrCl3 + NaOH → Ir2O3 + HCl + NaClHow many grams Ir2O3 (MW = 432 g/mol) are produced from 199 grams IrCl3 (MW = 299 g/mol)?

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Chemistry

12/05/22

General Chemistry

A sphere of metal has a mass of 1139 g and a diameter of 7.70 cm. What is the density of metal in g/cm3? You measure the following dimensions of a rectangular metal block of metal A: length = 11.0... more

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Chemistry

11/07/22

neutralizing balanced equations

The balanced equation for the neutralization reaction of aqueous H2SO4H2SO4 with aqueous KOHKOH is shown.H2SO4(aq)+2KOH(aq)⟶2H2O(l)+K2SO4(aq)H2SO4(aq)+2KOH(aq)⟶2H2O(l)+K2SO4(aq)What volume... more

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Math Science Chemistry

09/06/22

The following questions deal with the nature of light and color. (Enter your answers using scientific notation.)

a) A photon has a wavelength of 510. nanometers (nm). What is the length in meters?b) What is the frequency of this photon? _____ s-1c) What is the energy of this photon? ___J

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Science Chemistry

09/05/22

When ionic solids dissolve in water, they produce soluble aqueous cations and anions. For example, adding MgBr2 solids to water will produce ions according to the dissolution reaction below.

MgBr2(s) → Mg2+(aq) + 2 Br−(aq)cation AnionIn this lab, you will be observing the color of emission from ions dissolved in solution. Please write the dissolution reaction for each of the... more

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Chemistry

08/27/22

Assume the complete reaction of 6.53 g of O2 in the following reaction to determine the other quantities. 2 O2 + 3 Fe → Fe3O4

Assume the complete reaction of 6.53 g of O2 in the following reaction to determine the other quantities.2 O2 + 3 Fe → Fe3O4(a) moles of O2 reacting(b) moles of Fe required (c) moles... more

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Chemistry Biochemistry

08/26/22

Calculate the pH of an aqueous solution of the following:

2 x 10^-8 M KOHSo, for this I am getting the -log(2x10^-8) and I am getting 7.69 but the answer is suppose to be 7.1?Could anyone show how they get to the correct answer? I think I am doing... more

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Enthalpy Calculations

Standard enthalpy of formation of C8H18?

The standard heat of formation for Be(OH)2(s) is -903 kJ/mol at 298 K. Write the formation equation for Be(OH)2(s) that goes with this value of ΔH°.

a pure sample of silver has 2.79 X10^23 atoms of silver. What mass of silver is present in this sample

If 15.9 grams of iron react with 12.8 grams of oxygen gas, how many grams of iron (III) oxide are produced? What is the limiting reactant and what is the excess reactant in this reaction?

How I set up my class online, I already found the tutor

What is the concentration of NO3- ions in a solution prepared by dissolving 15.0 g of Ca(NO3)2 in enough water to produce 300. mL of solution?

Compare the gas pressure in a one-liter samples of oxygen, nitrogen, and neon, each with a mass of 2.0 g at 25 °C. Put in descending order.

At what pressure does methane (CH₄) have a density of 17.2 g/L at 49.5 °C?

Solve for the enthalpy change of steam reforming methane

At a certain temperature, the equilibrium constant, 𝐾, for the given reaction is 53.3. H2(g)+I2(g)↽−−⇀2HI(g)𝐾=53.3

Ideal gas calculation

Ideal gas calculation

What is the pressure (in atm) in a 5.00 L tank with 17.00 grams of oxygen gas at 350K

Obtain grams of lead

The solution contains 1.18 moles of the unknown. What is the molar mass of the unknown compound?

The molality of the solution is 3.63 m. What quantity in moles of the unknown compound were dissolved in the solution?

Use the ratio in the balanced chemical equation below to determine how many moles of sodium (Na) are required to produce 0.6 moles of sodium oxide (Na2O).

How many grams Ir2O3 (MW = 432 g/mol) are produced from 199 grams IrCl3 (MW = 299 g/mol)?

General Chemistry

neutralizing balanced equations

The following questions deal with the nature of light and color. (Enter your answers using scientific notation.)

When ionic solids dissolve in water, they produce soluble aqueous cations and anions. For example, adding MgBr2 solids to water will produce ions according to the dissolution reaction below.

Assume the complete reaction of 6.53 g of O2 in the following reaction to determine the other quantities. 2 O2 + 3 Fe → Fe3O4

Calculate the pH of an aqueous solution of the following:

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