The temperature on a sample of pure X held at 1.13 atm and -9. °C is increased until the sample boils. The temperature is then held constant and the pressure is decreased by 0.39 atm. On the phase diagram below draw a path that shows this set of changes. 200 400 temperature (K) pressure (atm)

The pressure above a pure sample of solid Substance X at -142. °C is raised. At what pressure will the sample melt? Use the phase diagram of X below to find your answer. بالا pressure (atm) 0 0. atm solid liquid 200 temperature (K) Note: your answer must be within 0.125 atm of the exact answer to be graded correct. gas X 400

The pressure above a pure sample of solid Substance X at -10. °C is lowered. At what pressure will the sample melt? Use the phase diagram of X below to find your answer. pressure (atm) 04- 02- 6 0 atm solid liquid 400 temperature (K) Note: your answer must be within 0.025 atm of the exact answer to be graded correct. gas 600

A scientist is comparing the properties of the molecules HF and HCl. Unfortunately, he mixes up the beakers containing the molecules. To solve this, he decides to find the boiling point of each. He finds that the molecule in beaker A has a higher boiling point than beaker B. Which molecule is in beaker A and which is in beaker B? Explain your answer. ***Be sure to include the type of intermolecular forces experienced by BOTH molecules when explaining your answer.***