1) What type of intermolecular forces must be overcome in converting each of the
ID: 979849 • Letter: 1
Question
1) What type of intermolecular forces must be overcome in converting each of the following from a liquid to a gas? (circle all that apply) (a) CO2 dispersion dipole-dipole hydrogen bonding ion-dipole (b) NH3 dispersion dipole-dipole hydrogen bonding ion-dipole (c) CHCl3 dispersion dipole-dipole hydrogen bonding ion-dipole (d) CF4 dispersion dipole-dipole hydrogen bonding ion-dipole 2) What is the total quantity of heat required to convert 0.45 moles of ice from –7.0 °C to steam at 108.0 °C? Hfus = 334Jg Hvap = 2260Jg Cice(s) = 2.09Jg°C Cwater(l) = 4.18Jg°C Csteam(g) = 2.03Jg°C
Explanation / Answer
1.
(a) CO2 = dispersion forces.
(b) NH3 = hydrogen bonding
(c) CHCl3 = dipole-dipole forces.
(d) CF4 = dispersion forces.
2. Heat required = mice*s*DT + w*DHfus + mwater*s*DT + w*DHvap + msteam*s*DT
mass of ice = 0.45*18 = 8.1 grams
= 8.1*2.09*(0--7) +8.1*334 + 8.1*4.18*(100-0)+8.1*2260+8.1*2.03*(108-100)
= 24647.25 joule.
= 24.647 kj
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