15. In the liquid, there are hydrogen bonds that form between molecules of water and covalent bonds that form between hydrogen and oxygen within a water molecule. Which statement(s) are true about When water is boiling, which statement(s) are true?

The vapor pressure of liquid methanol, CH3OH, is 100. mm Hg at 294 K. A 6.09×10² g sample of liquid CH3OH is placed in a closed, evacuated 490. mL container at a temperature of 294 K. Assuming that the temperature remains constant, will all of the liquid evaporate? What will the pressure in the container be when equilibrium is reached? mm Hg

Relating vapour pressure to vaporisation.

Need answers for the blue parts,thank you!!

Study the following phase diagram of Substance X. pressure (atm) 24 solid 100 liquid 200 temperature (K) Use this diagram to answer the following questions. a gas 300 Suppose a small sample of pure X is held at -12. °C and 12.0 atm. What will be the state of the sample? Suppose the temperature is held constant at -12. °C but the pressure is decreased by 6 atm. What will happen to the sample? Suppose a small sample of pure X is held at -12. °C and 12.0 atm. What will be the state of the sample? Suppose the temperature is held constant at -12. °C but the pressure is decreased by 6 atm. What will happen to the sample? Suppose, on the other hand, the pressure is held constant at 12.0 atm but the temperature is decreased by 116. °C. What will happen to the sample? (choose one) (choose one) (choose one) (choose one) (choose one)

Which of these statements about hydrogen bonds is not true? Individual hydrogen bonds in liquid water exist for less than a second. Hydrogen bonds do not account for the anomalously high boiling point of water. O In liquid water, the average water molecule forms hydrogen bonds with three to four other water molecules. Individual hydrogen bonds are much weaker than covalent bonds. The strength of a hydrogen bond depends on the linearity of the three atoms involved in the bond.

This graph shows how the vapor pressure of three liquids varies with temperature: vapor pressure, torr 900- 800- 700- 600 500 400. 300 200 100. 0+ 100 130 temperature, °C Use the graph to answer the following questions: 110 120 Which liquid is the most volatile? Which is the least volatile? What is the normal boiling point of each liquid? Note: your answer must be within 1°C of the exact answer to be Suppose a beaker of isobutyl alcohol is put inside a sealed tank containing isobutyl alcohol gas at 106. degree C and 701. torr. After ten minutes, will there be more liquid in the beaker, less liquid, or the same amount? ▪ethylbenzene - isobutyl alcohol orthoxylene 140 most volatile: least volatile: ethylbenzene: isobutyl alcohol: orthoxylene: more less the same ✓ choose one ethylbenzene isobutyl alcohol orthoxylene °C °C

The enthalpy of vaporization of Substance X is 8.00 Round your answer to 2 significant digits. 0 atm x10 × kJ and its normal boiling point is -61. °C. Calculate the vapor pressure of X at - 103. °℃. mol Ś

Prior to the discovery that freon-12 (CF2Cl2) was harmful to the Earth's ozone layer, it was frequently used as the dispersing agent in spray cans for hair spray, etc. Its enthalpy of vaporization at its normal boiling point of -29.2 degree C is 20.25 kJ/mol. Estimate the pressure that a can of hair spray using freon-12 had to withstand at 40 degree C, the temperature of a can that has standing in sunlight.

How do I approach this question?