5) Within each group, assign each of the boiling points to the appropriate subst

Question

5) Within each group, assign each of the boiling points to the appropriate substance on the basis of intermolecular

forces

(a) Ne, Ar, Kr: –246 °C, –186 °C, –152 °C

(b) NH3, H2O, HF: –33 °C, –20 °C, 100 °C

6) Name the phase transition in each of the following situations and indicate whether it is exothermic or

endothermic:

(a) Bromine vapor turns to bromine liquid as it is cooled.

(b) Crystals of iodine disappear from an evaporating dish as they stand in a fume hood.

(c) Rubbing alcohol in an open container slowly disappears.

(d) Molten lava from a volcano turns into solid rock.

7) Calculate the amount of heat required to convert 65.0 g of ice at °-4 C to steam at 113. °C.

8) Which one of the following would have the highest molar heat of vaporization?

a. CH3NH2 b. CH4 c. C2H6 d. SiH4 e. H2S

Explanation / Answer

The question contains sub-parts as well, i have answered 6 sub-parts, please post one more question to get the remaining answers. Thanks

Q5)

(a) In case of inert gases, the boiling point increases down the group, Hence the boling point of Neon will be lowest followed by Argon and then Krypton

Neon Boiling Point - -246C

Argon Boiling Point - -186C

Krypton Boiling Point - -152C

(b) Boiling point of ammonia is lowest being a gas, HF will be followed next and the maximum will be water

Boiling Point of NH3 = -33C

Boiling Point of HF = -20C

Boiling Point of H2O = 100C

6)

a) Vapos turning into liquid

Hence the phase transition is from gaseous state to liquid state

b) Crystal getting disappeared

Hence the phase transition is from solid state to gaseous state

c) Rubbing alcohol in an open container slowly disappears.

Hence the phase transition is from liquid state to gaseous state

d) Molten lava from a volcano turns into solid rock.

Hence the phase transition is from liquid state to solid state

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