Part A What is the boiling point of water at an elevation of 1.65×10 4 ft ? Expr
ID: 1023329 • Letter: P
Question
Part A
What is the boiling point of water at an elevation of 1.65×104 ft ?
Express your answer with the appropriate units using three significant figures.
The vapor pressure of a substance describes how readily molecules at the surface of the substance enter the gaseous phase. At the boiling point of a liquid, the liquid's vapor pressure is equal to or greater than the atmospheric pressure exerted on the surface of the liquid. Since the atmospheric pressure at higher elevations is lower than at sea level, the boiling point of water decreases as the elevation increases. The atmospheric pressure at sea level is 760 mmHg. This pressure decreases by 19.8mmHg for every 1000-ft increase in elevation. Elevation Pressure 0 ft 760 mmHg 1000 ft 740.2 mmHg 2000 ft 720.4 mmHg The boiling point of water decreases 0.05C for every 1 mmHg drop in atmospheric pressure.Part A
What is the boiling point of water at an elevation of 1.65×104 ft ?
Express your answer with the appropriate units using three significant figures.
T =Explanation / Answer
the presssur at 1.65*104 ft = 760- 1.65*104*19.8/1000 =433.3 mm Hg ( 19.8 mm Hg drop will be there for every 1000 ft)
Boiling point at 433.3 mm Hg =100-0.05*433.3/1 =78.335 deg.c ( there is a drop of 0.05 deg.c for every 1mm Hg drop in pressure)