The specific heat of liquid thallium , Tl, is 0.13 J/g C. The heat of fusion of thallium is 4.29 kJ/mol. The heat of vaporization of thallium is 162.5 kJ/mol. How much heat is required to change 10.0 g of solid thalium at 304 degrees C to vapor at 1457 degrees C ? The melting point of thallium is 304 degrees C. The boiling point of thallium is 1457 degrees C.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation