Use the Clausius Clapeyron equation, which is derived from the Clapeyron equation for equilibria between phases.

ln(p2/p1)= (deltaH/RT1)- (deltaH/RT2)

In your problem,

p2=760 torr

T2=373 K

p1=560 torr

deltaH= 40700

R=8.31

Calculate for T1.

The second problem can be solved similarly.I hope i calculated correctly, the principle is right.

The Clapeyron eqn is:

dp/dT= deltaS/deltaV

for condensed phase-vapour equilibria, deltaV = molar volume of gas since, volume of gas>> volume of solid or liquid.

also, deltaS=deltaH(vap)/T, at boiling point

then use the ideal gas eqn for 1 mole, you get the Clausius-Clapeyron eqn.