(8 pts) y your 1) 3pts. Rank the following compounds in order of increasing vapo

Question

(8 pts) y your 1) 3pts. Rank the following compounds in order of increasing vapor pressure at 298 °C and justif answer. Note that the stronger the intermolecular forces the smaller the vapor pressure (ii) 2pts. Which of the following substances is Icast soluble in water? Justify your answer (ii) 3 pts Which of the following compounds, co,, NO, SO, or H,S has the weakest interactions (a) CH,CHOH (b) CH,OCH (c) CH,CH CH (a) CHs(CH2)2CH OH (b) CH(CH)CH OH (c) CH,(CHa)eCH OH between molecules? 2. (8pts Identify the types of attractive forces that are present in cach case and indicate which is most likely the strongest force in cach case. (a) NH2OFH (b) N2 (c) CIF (d) BaF2 (4 pts) Classify cach of the following solids as either ionic, metallic, molecular, or covalent (a) C(diamond) (b) Co (c) CIBr (d) CaCl The odor of fresh cut pine is due, in part, from a chemical called pinene. This chemical has a vapor pressure of 760 torr at 429 K and 515 torr at 415 K.. What is the heat of vaporization of this substance in kJ/mol and what is vapor pressure in torr of this substance at 387 K? (12pts)

Explanation / Answer

1)

(i) vapour pressure increasing order : a < b < c

explanation: CH3CH2OH has hydrogen bond strong intermolecular force . CH3OCH3 has dipole -dipole forces CH3CH2CH3 has weak dispersion forces .

intermolecular forces increases vapour pressure decreasing.

(ii) least soluble in water is C)

the reason is non-polar part increases solubility will decreases . the compound C) has higher molar mass and more non-polar part so it should be least soluble

(iii) CO2 and NO2 both have weakest interactions because they have only dispersion forces. but SO2 and H2S have dipole -dipole forces

2) a) NH2OH ---------> hydrogen bond

    b) N2----------> dispersion

c) ClF -------------> dispersion

d) BaF2 --------> ionic bond

BaF2 has strongest intermolecular forces

3)

a) C ----------> covalent

b) Co ----------> metallic

c) ClBr ------------> molecular

d) CaCl2 -------------> ionic

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