Question 11.13: Convert 18.4 in. Hg to torr....
Convert 18.4 in. Hg to torr.
Step-by-Step
GIVEN: 18.4 in. Hg
FIND: torr
RELATIONSHIPS USED
1 atm = 29.92 in. Hg (Table 11.1)
760 torr = 1 atm (Table 11.1)
18.4 \cancel{in. Hg} \times \frac{1 \cancel{atm}}{29.92 \cancel{in. Hg}}\times \frac{760 torr}{1 \cancel{atm}}=467 torrThe units (torr) are correct. The value of the answer is reasonable because the torr is a smaller unit than in. Hg; therefore the value of a pressure in torr should be larger than in in. Hg.
| TABLE 11.1 Common Units of Pressure | |||
| Unit | Average Air Pressure at Sea Level | ||
| pascal (Pa) | 101,325 Pa | ||
| atmosphere (atm) | 1 atm | ||
| millimeter of mercury (mm Hg) | 760 mm Hg (exact) | ||
| torr (torr) | 760 torr (exact) | ||
| pounds per square inch (psi) | 14.7 psi | ||
| inches of mercury (in. Hg) | 29.92 atm | ||
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