alleryStart learning →A weather station reports 29.2 in. Hg. Taking 1 in. as 25.4 mm and 1 mm Hg as 1 torr, what is this pressure in torr?
A292 torr
B742 torr
C760 torr
D988 torr
Answer & Solution
Correct answer: B. 742 torr
1. The reading is a height of mercury in inches, so first turn inches into millimetres.
2. Use the conversion 1 in. = 25.4 mm: 29.2 in. x 25.4 mm/in. = 741.68 mm Hg.
3. Use the conversion 1 mm Hg = 1 torr, so 741.68 mm Hg = 741.68 torr.
4. Rounded to three significant figures this is 742 torr.
5. The answer 760 torr is standard atmospheric pressure, which this reading is close to but below, so it is the trap.
6. The answer 292 torr comes from dropping the inch to millimetre step altogether.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
Keep practising Gases
Browse all Gases questions for IMU CET, or explore more Chemistry topics.
Related questions
The van der Waals equation reduces to PV = nRT under which condition?A 4.25 L flask holds 3.46 mol of carbon dioxide at 229 degrees C. What pressure does the iIn the van der Waals equation, what does the constant b account for?Who developed the first and simplest equation that improves on the ideal gas law?Under which conditions does a real gas behave most nearly like an ideal gas?For a gas showing perfectly ideal behaviour, the compressibility factor Z takes which valuKinetic molecular theory explains Boyle's law by which change when the volume of a gas decAt a fixed temperature, how do lighter gas molecules compare with heavier ones?