Question

The boiling point of alcohol is 78.3 degrees Celcius at 760 mm atm pressure. Would the boiling point be higher or lower than 78.3 degree Celcius at hugher altirudes? Why?

Answer 1

The pressure is less, the b.p. is defined as that temperature at which the vapor pressure of the substance is the same as atmospheric pressure; therefore, the boiling point is less because the pressure is less. If you had wanted to figure this out yourself you could have put some numbers into the Clausius-Clapeyron equation and calculate the new b.p. at any pressure you chose.