Which has the smallest enthalpy of fusion? a. HCl b. Li2O c. MgO d. H2O Which has the highest normal boiling point? a. CH4 b. NH3 c. H2O Which has the greatest heat of vaporization? a. H2O b. H2Se c. H2Te d. H2S Which has the greatest vapour pressure at 25°C? a. H2O b. CO2 c. SiO2 Which has the least viscosity? a. HOCH2CH2OH b. CH3CH2OH c. CH3(CH2)3CH3

The enthalpy of fusion is known as the latent heat of fusion of a substance. It results from providing energy typically heat to an object. The smallest enthalpy of fusion is thus HCL gas.

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1. Answer is a. HCl gas

2. Answer is c. H2O liquid

3. Answer is a.H2O liquid

4. Answer is b.CO2 gas

5. Answer is c.CH3(CH2)3CH3

Explanation:

1. Which has the smallest enthalpy of fusion?

a. HCl gas

b.Li2O solid

c. MgO solid

d. H2O liquid

Answer is a. HCl gas

2. Which has the highest normal boiling point?

a.CH4 gas

b. NH3 gas

c. H2O liquid

Answer is c. H2O liquid

3. Which has the greatest heat of vaporization?

a.H2O liquid

b. H2Se gas

c. H2Te gas

d.H2S gas

Answer is a.H2O liquid

4. Which has the greatest vapour pressure at 25°C?

a. H2O liquid

b.CO2 gas

c. SiO2 solid

Answer is b.CO2 gas

5. Which has the least viscosity? a. HOCH2CH2OH syrupy liquid

b. CH3CH2OH liquid boiling point above 70 °C

c.CH3(CH2)3CH3 liquid, low boiling point below 40 °C

Answer is c.CH3(CH2)3CH3