Recent questions in Chemistry

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Determine the standard enthalpy change for the reaction between calcium oxide and hydrochloric acid, given the following information:CaO(s) + 2HCl(aq) → CaCl2(aq) + H2O(l)∆Hf° CaCl2(aq) = -795.7 kJ/mol∆Hf° H2O(l) = -285.8 kJ/mol∆Hc° = -1922.6 kJ/mol

asked Feb 4 in Chemical thermodynamics by CarmellaBibl (2.0k points)

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1 answer 132 views

Determine the standard enthalpy change for the precipitation reaction of 10.0 g of calcium chloride (CaCl2) with excess sodium carbonate (Na2CO3) to form calcium carbonate (CaCO3) and sodium chloride (NaCl). Given the following standard enthalpies of formation: ΔHf°(CaCl2) = -795.8 kJ/mol, ΔHf°(Na2CO3) = -1130.1 kJ/mol, ΔHf°(CaCO3) = -1206.9 kJ/mol, and ΔHf°(NaCl) = -411.2 kJ/mol.

asked Feb 4 in Chemical thermodynamics by IDQMyles1187 (2.5k points)

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1 answer 149 views

Determine the standard enthalpy change for the precipitation reaction between aqueous solutions of silver nitrate (AgNO3) and potassium chloride (KCl), given the molar concentrations of AgNO3 and KCl are 0.10 M and 0.20 M, respectively. The balanced chemical equation for the reaction is:AgNO3(aq) + KCl(aq) -> AgCl(s) + KNO3(aq)The enthalpies of formation for AgNO3(aq), KCl(aq), AgCl(s), and KNO3(aq) are -365.6 kJ/mol, -436.0 kJ/mol, -127.0 kJ/mol, and -494.6 kJ/mol, respectively.

asked Feb 4 in Chemical thermodynamics by CorneliusMen (2.2k points)

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1 answer 146 views

Determine the standard enthalpy change for the formation of water (H2O) when hydrogen gas (H2) reacts with oxygen gas (O2) according to the balanced equation:2H2(g) + O2(g) → 2H2O(l)Given that the standard enthalpy change of formation for H2O(l) is -285.8 kJ/mol, calculate the amount of heat absorbed or released when 4.50 moles of H2O(l) is formed under standard conditions.

asked Feb 4 in Chemical thermodynamics by CIGArmando01 (1.8k points)

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1 answer 134 views

Determine the standard enthalpy change for the formation of methane gas (CH4) from its constituent elements (C and H2) given the following standard enthalpy of formation values: ΔHf°(C) = 0 kJ/mol and ΔHf°(H2) = 0 kJ/mol.

asked Feb 4 in Chemical thermodynamics by MargotFalkin (2.1k points)

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1 answer 137 views

Determine the standard enthalpy change for the following reaction: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) Given:ΔHf°[Fe2O3(s)] = -824.2 kJ/mol ΔHf°[CO(g)] = -110.5 kJ/mol ΔHf°[Fe(s)] = 0 kJ/mol ΔHf°[CO2(g)] = -393.5 kJ/mol

asked Feb 4 in Chemical thermodynamics by ClaraCraddoc (1.6k points)

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1 answer 140 views

Determine the standard enthalpy change for the following reaction: 2 Fe (s) + 3/2 O2 (g) → Fe2O3 (s) Given the following data: - ΔHf° of Fe2O3 (s) = -826 kJ/mol - ΔHf° of O2 (g) = 0 kJ/mol - The heat capacity of the calorimeter is 135 J/°C Assume that the reaction takes place at constant pressure and that the heat absorbed by the calorimeter is negligible.

asked Feb 4 in Chemical thermodynamics by EttaKee54894 (2.1k points)

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1 answer 122 views

Determine the standard enthalpy change for the dissolution of 5.00 grams of magnesium chloride in water, given that the molar mass of MgCl2 is 95.21 g/mol and the standard enthalpy change of formation for magnesium chloride is -641.3 kJ/mol.

asked Feb 4 in Chemical thermodynamics by EdithLindt35 (1.6k points)

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1 answer 142 views

Determine the standard electrode potential, given that the standard reduction potential for the half-reaction, Ag+ (aq) + e- → Ag(s) is +0.80 V and the standard oxidation potential for the half-reaction, Fe(s) → Fe2+(aq) + 2e-, is -0.44 V. Using this information, predict whether or not the reaction Ag(s) + Fe2+(aq) → Fe(s) + Ag+(aq) will occur spontaneously under standard conditions.

asked Feb 4 in Chemical thermodynamics by Miguel37A006 (2.3k points)

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1 answer 126 views

Determine the rate law for the reaction of nitrogen dioxide with hydrogen gas, if the reaction rate is directly proportional to the concentration of nitrogen dioxide and the square of the concentration of hydrogen gas. Express the rate law in terms of the rate constant and the concentrations of the reactants.

asked Feb 4 in Chemical kinetics by BeverlyNavar (1.8k points)

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1 answer 134 views

Determine the possible isomers of C3H8O using structural formulas and name the type of isomerism for each.

asked Feb 4 in Chemical bonding by ChristelZ81 (1.7k points)

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1 answer 137 views

Determine the polarity of the H-Cl bond in hydrogen chloride molecule, given the electronegativity values of hydrogen and chlorine to be 2.2 and 3.0, respectively.

asked Feb 4 in Chemical bonding by JedShackell5 (1.8k points)

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1 answer 125 views

Determine the oxidation state of the following elements in the compound potassium permanganate (KMnO4): a) Potassium b) Manganese c) Oxygen

asked Feb 4 in ElectroChemistry by Annett65L392 (2.1k points)

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1 answer 137 views

Determine the oxidation state of the chromium atom in the compound potassium dichromate (K2Cr2O7).

asked Feb 4 in Inorganic Chemistry by AnnettaCampb (1.8k points)

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1 answer 176 views

Determine the oxidation state of the carbon atom in the molecule C2H5OH.

asked Feb 4 in Chemical reactions by KennyWenz603 (1.7k points)

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1 answer 156 views

Determine the oxidation state of sulfur in sodium sulfite (Na2SO3) using the oxidation state rules and justify your answer with proper explanation.

asked Feb 4 in ElectroChemistry by JeroldStonem (1.6k points)

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1 answer 134 views

Determine the oxidation state of sulfur in H2SO4.

asked Feb 4 in Chemical reactions by EddieDurack (2.2k points)

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1 answer 89 views

Determine the oxidation state of each atom in the compound KMnO4.

asked Feb 4 in Chemical reactions by MeredithFeg5 (1.6k points)

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1 answer 162 views

Determine the oxidation state of chlorine in HClO3.

asked Feb 4 in Chemical reactions by FerminClatte (1.8k points)

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1 answer 157 views

Determine the oxidation state of all elements in the following compound: CoCl<sub>2</sub>•6H<sub>2</sub>O.

asked Feb 4 in Inorganic Chemistry by ElkeMary0923 (1.7k points)

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