In a student experiment, a constant$-$volume gas thermometer is calibrated in dry ice $(-78\mathrm{.}5C)$ and in boiling pentane $(36\mathrm{.}1C),$ The separate pressures are $0,902$atm and $1,442$atm. Hint: Use the linear relationship $P=A+BT,$ where A and $B$ are constants.

$($a$)$ What value of absolute zero does the calibration vield?

$1C$

$($b$)$ What pressure would be found at the freezing point of water?

$$

Use the linear relation whth the coefficients you detemined to find the pressure of the gas at the freezing point of wetwer atm

$($c$)$ What pressure would be found at the boiling point of water?

$q,\%$ atm