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6. (a)Which should have the higher boiling point, ethanol (CH:CH-OH) or ethanethiol (CH:CH SH) and why? (b) Why does the boiling point vary with atmospheric pressure?

Answer 1

Soin : Boiling point of Ethanol are much higher than Ethamethiol because of the Hydrogen bond Explanation • The O-H of alcohol as highly polay because oxygen Electronegative. The oxygen carries a partial negative charge Cof), the Hydrogen polarity of the Hydrogen cavies o partial positive change CS+) · the polarity in one molecule and partially negative oxygen in the force of attraction to as Hydrogen Bonding alcohol have higher boiling point is of Energy in the foom of heat) is required to overcome Boiling point of Ethane thiol are lower because of the absence of Hydro bond in thiols • another alcohol molecules. are heffered the reason that great deal these attractive force. St S. co- H - H- O R H H So it form no less Electronegative very And in thiol S is bond Hydrogen

the Atmospheric pressure decreases es Elevation in cu cases and boeling point decreases Explanation i Boiling point is the point at which vapawes poressure equale atmosphouc pressure • In a liquid, some particles always have enough energy to escape to gas phase. Graseous. patcles are also retwring retwring to the liquid The vapoua pressure is the pressure excested by the gas. amount of paticles leaving the liquid equel the paticle entering the liquid AS Elevation increases a tomospheric pressure docuease because at higher altitudes Because the atmospheric pressure is lower , the vapour pressere lower to such of the liquid needs to be e when the amount air is less dense the boiling point. Therefore less heat is required to make the vapour pressure Equal the atmosphereč pressure as yosunt is also lowere to bailing point As can be a result, liquid with higher vapour pressure have lower Bouling point - Vapour pressure more cousing increased tou molecule to enter the the vapowy pressure heating liquid and can atmosphere at the point where is equal to the atmospheric pressure boeling cerill Begin
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