Use these sketches to answer the questions in the table below. The enthalpy of s

Question

Use these sketches to answer the questions in the table below. The enthalpy of solution delta H_soln is positive when CH_3 OH dissolves in water. Use this information to list the stages in order of increasing to list the stages in order of increasing enthalpy. Would heat be absorbed or released if the system moved from Stage C to D? absorbed released neither absorbed nor released What force would oppose or favor the system moving from Stage C to D? Check all that apply. none ionic bonding force covalent bonding force metal bonding force hydrogen-bonding force dipole force ion-dipole force dispersion force

Explanation / Answer

Enthalpy of mixing is positive, thats mean it is an endothermic process.

Here, diagram A represent the starting substances, B and C are the intermediates and D is the final solution.

As it is an endothermic process, so enthaly of product will be higher than the reactants. So, enthalpy of D will be more than A. Intermediates are high energized species, so their enthalpy will be more than D. Now, C is more separated than B, so enthalpy of C will be more than B. So, overall order:

C > B > D > A (decreasing order of enthalpy)

If the system moves from C to D, heat will be absorbed, as the process is endothermic.

Forces that will favor or oppose the the system moving from C to D are hydeogen bonding force, dipole-dipole and dispersion force.

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