O GASES, LIQUIDS AND SOLIDs -Understanding conceptual components of the enthalpy

Question

O GASES, LIQUIDS AND SOLIDs -Understanding conceptual components of the enthalpy of solution A small amount of acetonitrile (CH,CN) is dissolved in a large amount of water. Imagine separating this process into the four stages sketched below. (These sketches show only a portion of the substances, so you can see the density and distribution of atoms and molecules in them.) A4 118 CHCN H2o solution Use these sketches to answer the questions in the table below The enthalpy of solution aHsoln is negative when CH3CN dissolves in water. Use this information to ist the stages in order of increasing enthalpy. D.D. O absorbed Would heat be absorbed or released if the system moved from Stage A to B? O released neither absorbed nor released

Explanation / Answer

Dissolution

When acetonitrile (CH3CN) is dissolved in water (H2O)., enthalpy dH of solution is negative

So,

List of stages based on enthalpy in increasing order = C > B > A > D

C and B are endothermic processes. D is exothermic process (-ve enthalpy)

Would heat be absorbed or released if the system moves from A to B = absorbed

What forces would oppose of favor the system moving from stage A to B,

hydrogen-bonding force

dipole force

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