In a student experiment, a constant-volume gas thermometer is calibrated in liqu
ID: 1490284 • Letter: I
Question
In a student experiment, a constant-volume gas thermometer is calibrated in liquid nitrogen (196°C ) and in boiling allyl alcohol (97°C). The separate pressures are 0.345 atm and 1.710 atm. Hint: Use the linear relationship P = A + BT, where A and B are constants.
(a) What value of absolute zero does the calibration yield?_____________ °C
(b) What pressure would be found at the freezing point of water? _______________atm
(c) What pressure would be found at the boiling point of water? _____________atm
Explanation / Answer
Here, P = A + BT
=> 0.345 = A - B*196
=> 1.710 = A + B*97
=> A = 1.258 atm
=> B = 0.00465 atm/°C
a) Here, 0 = 1.258 + 0.00465 *T
=> T = - 270.53 °C -----------------> value of absolute zero does the calibration yield
b) Here, P = 1.258 + 0.00465 *0
=> P = 1.258 atm -----------------> pressure found at the freezing point of water
c) Here, P = 1.258 + 0.00465 *100
=> P = 1.723 atm --------------------> pressure found at the boiling point of water