alleryStart learning →A barometer in Kansas City reads 740 torr. Using 760 torr = 101.325 kPa, what is this pressure in kilopascals?
A74.0 kPa
B101.3 kPa
C111.9 kPa
D98.7 kPa
Answer & Solution
Correct answer: D. 98.7 kPa
1. State the conversion factor: 760 torr corresponds to 101.325 kPa.
2. Scale the reading by the ratio: 740 torr x 101.325 kPa / 760 torr.
3. The arithmetic gives 98.66 kPa, which rounds to 98.7 kPa.
4. The value 101.3 kPa is one full atmosphere, so it is the answer you get by forgetting that 740 torr is less than 760 torr.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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