How much energy must be removed from a 94.4 g sample of benzene (molar mass= 78.11 g/mol) at 322.0 K to solidify the sample and lower the temperature to 205.0 K? The following physical data may be useful. ΔHvap = 33.9 kJ/mol ΔHfus = 9.8 kJ/mol Cliq = 1.73 J/g°C Cgas = 1.06 J/g°C Csol = 1.51 J/g°C Tmelting = 279.0 K Tboiling = 353.0 K

Answer : The energy removed must be, 29.4 kJ

Explanation :

The process involved in this problem are :

The expression used will be:  

where,

= heat released for the reaction = ?

m = mass of benzene = 94.4 g

= specific heat of solid benzene =

= specific heat of liquid benzene =

= enthalpy change for fusion =

Now put all the given values in the above expression, we get:

Negative sign indicates that the heat is removed from the system.

Therefore, the energy removed must be, 29.4 kJ

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

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