LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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1.3 In one English system of units, lengths are measured in
feet, masses are measured in pounds, abbreviated lb (1 lb =
0.4536 kg), and time is measured in seconds. The absolute
temperature scale is the Rankine scale, such that 1.8◦ R
corresponds to 1 ◦ C and to 1 K.
a. Find the acceleration due to gravity at the earth’s
surface in English units.
b. If the pound is a unit of mass, then the unit of force is
called the poundal. Calculate the value of the ideal gas
constant in ft poundals ( ◦ R) −1 mol −1 .
c. In another English system of units, the pound is a unit
of force, equal to the gravitational force at the earth’s
surface, and the unit of mass is the slug. Find the
acceleration due to gravity at the earth’s surface in this
set of units.
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