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Calculate the enthalpy change of polymerization for the formation of polystyrene from its monomer, styrene, given the following data:- ΔH°f (Styrene) = -25.68 kJ/mol- Bond enthalpies: C-C = 347 kJ/mol; C=C = 611 kJ/mol; C-H = 413 kJ/mol

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

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1 answer 110 views

A 25 mL solution of 0.1 M AgNO3 is mixed with a 50 mL solution of 0.05 M NaCl. What is the mass of AgCl that will be produced if a reaction occurs? (Assume the reaction goes to completion.)

asked Jan 22 in Chemical reactions by KarolinBalse (1.5k points)

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A chemist mixes 0.1 mol of hydrogen (H2) with 0.2 mol of nitrogen (N2) in a 2 L flask at 400°C. The reaction H2(g) + N2(g) ⇌ 2NH3(g) establishes equilibrium. Calculate the equilibrium concentrations of hydrogen, nitrogen, and ammonia if the Kc value of the reaction at this temperature is 1.5 x 10^-2.

asked Jan 22 in Chemical equilibrium by CarmaC633252 (1.7k points)

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1 answer 92 views

A student wants to determine the concentration of silver ions (Ag+) in a solution. Using an Ag/Ag+ reference electrode, the student measures the cell potential to be +0.56 V when the solution is electrolyzed for 25 minutes at a constant current of 0.50 A. The volume of the solution is 150 mL. What is the concentration of silver ions in the solution in mol/L?

asked Jan 22 in ElectroChemistry by WilburGuerre (2.3k points)

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1 answer 103 views

A chemistry student needs to determine the effect of increasing the pressure on the equilibrium position of a reaction. Consider the following reaction at equilibrium: N2(g) + 3H2(g) ⇌ 2NH3(g) If the pressure is increased, will the reaction shift to the left or right, and in what direction will the reaction quotient, Q, shift as a result? Justify your answer using Le Chatelier's principle.

asked Jan 22 in Chemical equilibrium by Hugo83583981 (1.5k points)

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1 answer 137 views

What is the pH of a 0.1 M solution of acetic acid (CH3COOH) at 25°C, given that the Ka of acetic acid is 1.8 x 10^-5?

asked Jan 21 in Organic Chemistry by CharmainRose (2.2k points)

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1 answer 92 views

A student synthesized two coordination compounds containing the same metal ion, ligands, and donor atoms. However, the student found that the two compounds exhibited different physical and chemical properties. Explain the possible types of isomerism that could exist in these coordination compounds and how they can be distinguished.

asked Jan 22 in Coordination Chemistry by EllisDonahue (2.6k points)

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1 answer 110 views

What is the pH of 0.1 M solution of HCl knowing that its dissociation constant is 1.3 x 10^-4?

asked Jan 22 in Inorganic Chemistry by LannyNewell (1.8k points)

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A 50.0 g sample of ethanol is heated from 25.0 °C to 85.0 °C, and absorbs 237 J of heat. What is the specific heat capacity of ethanol?

asked Jan 22 in ThermoChemistry by ValentinStec (1.9k points)

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1 answer 135 views

Balance the following chemical equation for the combustion of methane (CH4) in oxygen (O2) to form carbon dioxide (CO2) and water (H2O): CH4 + O2 → CO2 + H2O

asked Jan 21 in Inorganic Chemistry by Estella80D9 (2.2k points)

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1 answer 95 views

A student needs to calculate the activation energy for a reaction that takes place at an electrode with a current density of 2.5 mA/cm² at a temperature of 25°C. The reaction has a transfer coefficient of 0.5 and a standard rate constant of 2.0 × 10⁻⁶ cm/s. The student has access to the necessary thermodynamic data for the reaction. What is the activation energy for this electrochemical reaction?

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

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1 answer 98 views

A chemistry student was given a sample of an unknown compound. The student performed an analysis on the sample using mass balance calculations and obtained the following data: the sample had a mass of 2.64 g and contained 1.32 g of carbon, 0.22 g of hydrogen, and 0.88 g of oxygen. What is the molecular formula of the unknown compound?

asked Jan 22 in Analytical Chemistry by RobynButz517 (1.9k points)

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1 answer 138 views

Identify the number of stereoisomers for the compound 2,3-dibromobutane and draw their structures.

asked Jan 21 in Organic Chemistry by KelleS495456 (1.9k points)

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1 answer 171 views

According to the Global Space Theory, what aspect of neuronal activity creates consciousness?

asked Jan 20 in Psychology by BuckY7205505 (1.7k points)

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1 answer 102 views

A chemistry student needs to determine the percent composition of nitrogen (N) in a sample of an unknown organic compound. Using elemental analysis, the student determines the mass of the sample to be 0.254 g and the mass of the products after combustion to be 0.727 g of CO2 and 0.298 g of H2O. What is the percent composition of nitrogen in the sample?

asked Jan 22 in Analytical Chemistry by DanielleSauc (2.4k points)

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1 answer 63 views

Calculate the bond order and bond length of the nitrogen-oxygen bond in the NO molecule using molecular orbital theory.

asked Jan 23 in Inorganic Chemistry by Marilynn3793 (2.1k points)

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1 answer 136 views

What is the balanced equation for the oxidation of ethanol to ethanoic acid? Include the oxidation state of each carbon atom before and after the reaction.

asked Jan 21 in Organic Chemistry by Precious09K0 (2.0k points)

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1 answer 64 views

Calculate the amount of ozone depletion caused by the release of 1000 metric tons of chlorofluorocarbons (CFCs) into the atmosphere and explain the impact it can have on the atmosphere in terms of UV radiation and human health.

asked Jan 23 in Environmental Chemistry by Fawn72203404 (2.2k points)

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1 answer 136 views

What is the balanced chemical equation for the oxidation of ethylene (C2H4) with potassium permanganate (KMnO4), and what are the oxidation states of the carbon atoms before and after the reaction?

asked Jan 21 in Organic Chemistry by AlishaGuy35 (2.5k points)

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1 answer 89 views

Balance the following chemical equation: Fe + O2 → Fe2O3

asked Jan 22 in Chemical reactions by MarisolWebst (1.8k points)

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