EX 1 · Question 3 Place the following substances in order of decreasing boiling

Question

EX 1

·       Question 3

Place the following substances in order of decreasing boiling point.

             N2          O2          H2

·       Question 4

List the following molecules in order of increasing boiling point:

·       Question 6

How much energy is required to heat 36.0 g H2O from a liquid at 54.0°C to a gas at 145.0°C? The following physical data may be useful.

Hvap = 40.7 kJ/mol

Cs, liq = 4.18 J/gC

Cs, gas = 2.01 J/(gC)

Cs, sol = 2.09 J/(gC)

Melting point of water = 0.0C

Boiling point of water = 100.0C

Place the following substances in order of decreasing boiling point.

             N2          O2          H2

·       Question 4

List the following molecules in order of increasing boiling point:

·       Question 6

How much energy is required to heat 36.0 g H2O from a liquid at 54.0°C to a gas at 145.0°C? The following physical data may be useful.

Hvap = 40.7 kJ/mol

Cs, liq = 4.18 J/gC

Cs, gas = 2.01 J/(gC)

Cs, sol = 2.09 J/(gC)

Melting point of water = 0.0C

Boiling point of water = 100.0C

List the following molecules in order of increasing boiling point: Dimethyl ether n-Propanol Diethyl ether

Explanation / Answer

Question 3.
The decreasing order of boiling points is
O2( 90 K) > N2    (77.2 K) > H2 (20.4 K)
This is same as decreasing order of molecular weights.

Question 4.
The increasing order of boiling points is
dimethyl ether < diethyl ether < n-propanol.
With increase in molecular weight, boiling point increases.
Also alcohol has higher boiling point than ether due to hydrogen bonding.

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