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Calculate the bond length of a carbon-hydrogen bond in ethane (C2H6). Given that the distance between carbon atoms is 1.54 Å and the bond angle between carbon and hydrogen is 109.5°.

asked Jan 23 in Chemical bonding by NataliaCaple (2.1k points)

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1 answer 111 views

A chemistry student needs to determine the effect of adding more reactant or product on the equilibrium position of the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)If the student adds more N2 or NH3 to the reaction mixture, how will the equilibrium position change? and how will the equilibrium constant (Kc) for the reaction be affected?

asked Jan 22 in Chemical equilibrium by JeanetteOffi (1.7k points)

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1 answer 74 views

Calculate the amount of heat required to melt 25 grams of ice at 0°C. The enthalpy of fusion of ice is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry by EmilySulman6 (2.0k points)

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1 answer 70 views

Calculate the density of solid sodium chloride given that its mass is 5.50 g and its volume is 2.50 cm³.

asked Jan 23 in Inorganic Chemistry by Dawn49061396 (2.1k points)

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1 answer 71 views

Calculate the change in enthalpy for the combustion of 2 moles of methane gas (CH4) at a constant pressure of 1 atmosphere and a temperature of 298 K. Given the standard enthalpy of formation for methane is -74.81 kJ/mol.

asked Jan 23 in Physical Chemistry by JadaMeece33 (1.6k points)

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1 answer 107 views

A chemistry student wants to determine the enthalpy change of a chemical reaction. They have 25 g of sodium hydroxide and want to mix it with 50 mL of 1.0 M hydrochloric acid. What is the maximum temperature change they can expect to see, assuming constant pressure and perfect heat transfer, and what is the enthalpy change of the reaction?

asked Jan 22 in Physical Chemistry by JosetteSarto (2.0k points)

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1 answer 111 views

A chemistry student needs to determine how the equilibrium constant (Kc) will change when the volume of the container is increased by a factor of 3 for the following reaction at a certain temperature:2NO2(g) ⇌ N2O4(g)

asked Jan 22 in Chemical equilibrium by Georgianna69 (2.2k points)

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1 answer 63 views

Calculate the enthalpy of desorption of hydrogen gas (H2) from a platinum surface, given that the temperature of the surface is 298 K and the pressure of H2 gas above the surface is 1 atm. The adsorption enthalpy of H2 on Pt is -43300 J/mol. (Assume ideal gas behavior for H2.)

asked Jan 23 in ThermoChemistry by TahliaEvatt8 (2.2k points)

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1 answer 59 views

Calculate the enthalpy of vaporization of water given that it has a vapor pressure of 1.00 atm at 100°C and its molar enthalpy of vaporization at 373 K is 40.7 kJ/mol.

asked Jan 23 in ThermoChemistry by MoniqueBrins (1.9k points)

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1 answer 143 views

Balance the following chemical equation for the inorganic compound calcium hydroxide reacting with hydrochloric acid: Ca(OH)2 + HCl -> CaCl2 + H2O

asked Jan 21 in Inorganic Chemistry by AddieFrayne (1.7k points)

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1 answer 74 views

Calculate the amount of heat absorbed or released when 20 grams of dry ice (solid carbon dioxide) is converted to gaseous carbon dioxide at -78.5°C and atmospheric pressure, given the heat of sublimation of dry ice is 25.2 kJ/mol.

asked Jan 23 in ThermoChemistry by MichelleHall (2.0k points)

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1 answer 74 views

Calculate the amount of energy required to vaporize 100 grams of liquid water at its boiling point (100°C) given its enthalpy of vaporization is 40.7 kJ/mol.

asked Jan 23 in ThermoChemistry by MaximoVardon (1.9k points)

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1 answer 110 views

A chemistry student needs to determine the percentage of iron (Fe) present in a given iron ore sample using gravimetric analysis. The student is provided with the mass of the iron ore sample and a standardized solution of potassium dichromate (K2Cr2O7) to use for the analysis. What is the percentage of iron (Fe) in the given iron ore sample?

asked Jan 22 in Analytical Chemistry by SimonMcWilli (1.9k points)

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1 answer 112 views

A chemistry student has 10 grams of magnesium and 15 grams of oxygen gas to produce magnesium oxide. What is the limiting reactant and how much magnesium oxide can be produced?

asked Jan 22 in Chemical reactions by TereseMandal (1.7k points)

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1 answer 99 views

A student wants to find out the cell potential of a voltaic cell made up of a nickel electrode and an iron electrode. The nickel electrode is in a 0.1 M nickel (II) sulfate solution, and the iron electrode is in a 0.1 M iron (II) sulfate solution. What is the cell potential of this voltaic cell at standard conditions (25°C and 1 atm of pressure) given the standard reduction potentials for Ni2+/Ni and Fe2+/Fe are -0.25 V and -0.44 V, respectively?

asked Jan 22 in ElectroChemistry by RachelMcCann (2.2k points)

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1 answer 98 views

Assuming a standard hydrogen electrode is used as the reference electrode and a copper electrode is used as the working electrode in an electrochemical cell, calculate the polarization potential when the current density on the copper electrode is 0.5 mA/cm^2 and the concentration of Cu2+ in the solution is 0.1 M.

asked Jan 22 in ElectroChemistry by MelbaTulloch (2.2k points)

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1 answer 66 views

Calculate the enthalpy change for the isomerization of butene-1 to butene-2 given that the standard enthalpy of formation of butene-1 is -25.3 kJ/mol and the standard enthalpy of formation of butene-2 is -23.6 kJ/mol. The reaction is carried out at a constant pressure of 1 atm and a temperature of 298 K.

asked Jan 23 in ThermoChemistry by AmeliaCuella (1.8k points)

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1 answer 111 views

A Chemistry student is trying to determine the effect of changing the volume on the equilibrium position of a chemical reaction at constant temperature. If the reaction is initially in equilibrium in a 1 L container with a concentration of [X] = 0.10 M and [Y] = 0.20 M, and then the volume is decreased to 0.4 L, what will be the new equilibrium concentrations of X and Y at the new volume?

asked Jan 22 in Chemical equilibrium by AshleighTheo (1.8k points)

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1 answer 66 views

Calculate the enthalpy change for the isomerization of But-1-ene to But-2-ene using the given bond enthalpies: C-C single bond (347 kJ/mol), C-H bond (413 kJ/mol), C=C double bond (611 kJ/mol), and the enthalpy of formation of But-1-ene (-4.8 kcal/mol) and But-2-ene (-0.9 kcal/mol).

asked Jan 23 in ThermoChemistry by KatherineRei (1.9k points)

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1 answer 64 views

Calculate the enthalpy of combustion of methane gas (CH4), given that the heat released when 1.0 g of methane completely burns in excess oxygen is -890 kJ.

asked Jan 23 in ThermoChemistry by SherriBorell (1.9k points)

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