Chapter 12: Q12.69P (page 496)
A water molecule can engage in as many as four H bonds. Explain.
A water molecule can engage as many as four H-bonds. This is because of the presence of two electron-donating H atoms and two electron-donating lone pairs of oxygen atoms.
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Distinguish between isotropic and anisotropic substances. To which category do liquid crystals belong?
Butane is a common fuel used in cigarette lighters and camping stoves. Normally supplied in metal containers under pressure, the fuel exists as a mixture of liquid and gas, so high temperatures may cause the container to explode. At , the vapour pressure of butane is 2.3 atm. What is the pressure in the container at vap ( =24.3 kJ/mol)?
Question: On a humid day in New Orleans, the temperature is , and the partial pressure of water vapor in the air is 31.0 torr. The 9000-ton air-conditioning system in the Louisiana Superdome maintains an inside air temperature of also, but a partial pressure of water vapor of 10.0 torr. The volume of air in the dome is , and the total pressure inside and outside the dome are both 1.0 atm.
a. What mass of water (in metric tons) must be removed every time the inside air is completely replaced with outside air?
(Hint: How many moles of gas are in the dome? How many moles of water vapor? How many moles of dry air? How many moles of outside air must be added to the air in the dome to simulate the composition of outside air?)
b. Find the heat released when this mass of water condenses.
Question: Is it possible for a salt of formula AB3 to have a face-centered cubic unit cell of anions with cations in all the eight available holes? Explain
Liquid hexane (bp:) is placed in a closed container at room temperature. At first, the pressure of the vapour phase increases, but after a short time, it stops changing. Why?
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