Question

Assign the correct boiling point and vapor pressures to the following compounds: (-24°C, 78°C, 97°C, 197°C) (0.5 kPa, 5.95 kPa, 1.99 kPa, 6.3 kPa) Анн Носс-он ннн HH.. H. HHH ннн но, с °H H Ethylene glycol H OH H H H Ethanol HHH Propanol CÇ-H HHH Methoxymethane

Answer 1

Ethylene glycol has high boiling point because it has 2 OH group which are involve in H-BONDING. Methoxymethane has least boiling point because it don't form H-BONDING. Propanol has high boiling point than ethanol because of its large molar mass. As the boiling point increases, less vapours are present at particular temperature thus, vapour pressure decreases.

Ethylene glycol : 197°C and 0.5 kPa

Ethanol : 78°C and 5.95 KPa

Propanol : 97°C and 1.99 kPa

Methoxymethane : -24°C and 6.3 KPa

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