Exam 11: Liquids, solids, and Intermolecular Forces

Calculate the total quantity of heat required to convert 25.0 g of liquid CCl₄(l)at 35.0 °C to gaseous CCl₄ at 76.8 °C (the normal boiling point for CCl₄).The specific heat of CCl₄(l)is $0.857 \mathrm {~J} \mathrm {~g} ^ { - 1 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$ its heat of fusion is $3.27 \mathrm {~kJ} \mathrm {~mol} ^ { - 1 }$ and its heat of vaporization is $29.82 \mathrm {~kJ} \mathrm {~mol} ^ { - 1 }$

In liquid ethanol, CH₃CH₂OH Which intermolecular forces are present?

Choose the substance with the lowest viscosity in the liquid phase.

Which of the following substances would you predict to have the highest Δ_vapH?

How much heat is released when 105 g of steam at 100.0 °C is cooled to ice at -15.0 °C? The enthalpy of vaporization of water is 40.67 kJ mol^-1,the enthalpy of fusion for water is 6.01 kJ mol^-1,the molar heat capacity of liquid water is 75.4 J mol^-1 °C^-1,and the molar heat capacity of ice is 36.4 J mol^-1 °C^-1.

Place the following substances in order of decreasing boiling point. H₂O $\quad$ N₂ $\quad$ CO

Assign the appropriate labels to the phase diagram shown below.

How many H^- ions are around each Na⁺ ion in NaH,which has a cubic unit cell with H^- ions on each corner and each face?

Which of the following is considered a nonbonding atomic solid?

Choose the substance with the highest boiling point.

The freezing point of water is ________.

Which of the following is considered an atomic solid?

Cesium has a radius of 272 pm and crystallizes in a body-centred cubic structure.What is the edge length of the unit cell?

Consider the phase diagram below.If the dashed line at 1 atm of pressure is followed from 100 to 500 °C,what phase changes will occur (in order of increasing temperature)?

Determine Δ_vapH for a compound that has a measured vapour pressure of 32.40 mbar at 273 K and 180.0 mbar at 325 K.

Place the following substances in order of decreasing boiling point. He $\quad$ Ar $\quad$ H₂

Why is the Δ_vapH higher than Δ_fusH for a given compound?

Which of the following compounds exhibits hydrogen bonding?

Place the following compounds in order of increasing strength of intermolecular forces. CO₂ $\quad$ F₂ $\quad$ NH₂CH₃

Identify the type of solid for AgCl.