The x-intercept shows us where the temperature can be no lower, defined as absolute zero. Absolute zero is OK. Look at the graph.
Did the line reach (0.0)? If not, how close to absolute zero was the line?

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .