Chapter 18: Q. 12 (page 511)
At what temperature does the numerical value in °F match the numerical value in °C?
The numerical value is
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A cylinder contains nitrogen gas.A piston compresses the gas
to half its initial volume.
a. Has the mass density of the gas changed? If so, by what factor?
If not, why not?
b. Has the number of moles of gas changed? If so, by what factor?
If not, why not?
An aquanaut lives in an underwater apartment 100 m beneath the surface of the ocean. Compare the freezing and boiling points of water in the aquanaut’s apartment to their values at the surface. Are they higher, lower, or the same? Explain.
The atomic mass number of copper is A = 64. Assume that atoms in solid copper form a cubic crystal lattice. To envision this, imagine that you place atoms at the centers of tiny sugar cubes, then stack the little sugar cubes to form a big cube. If you dissolve the sugar, the atoms left behind are in a cubic crystal lattice. What is the smallest distance between two copper atoms?
The semiconductor industry manufactures integrated circuits in large vacuum chambers where the pressure is 1.0 * 10-10 mm of Hg.
a. What fraction is this of atmospheric pressure?
b. At T = 20C, how many molecules are in a cylindrical chamber 40 cm in diameter and 30 cm tall?
A nebula—a region of the galaxy where new stars are forming—contains a very tenuous gas with . This gas is heated to by ultraviolet radiation from nearby stars. What is the gas pressure in atm?
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