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How much heat is required to melt 23.9 g of solid diethyl ether (at its melting point)?

Chapter 12, Problem 58P

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QUESTION:

How much heat is required to melt 23.9 g of solid diethyl ether (at its melting point)?

Questions & Answers

QUESTION:

How much heat is required to melt 23.9 g of solid diethyl ether (at its melting point)?

ANSWER:

Solution 58P

Step 1:

Given :

Amount of solid diethyl ether = 23.9 g

Heat required to burn given amount of solid diethyl ether((C2H5)2O) = ?

Formula to calculate the heat required :

 q = mHf 

where, q = heat in kJ,

m = mass(in grams),

Hf = heat of fusion

The standard enthalpy change of fusion (Hf) for diethyl ether is 7.19 kJ/mol.

We have Hf in terms of moles, but the mass is given in grams. So let’s find the number of moles for the given amount of  (C2H5)2O.

So, let’s find number of moles :

        Number of moles(m) =  

Molar mass of (C2H5)2O = 74.12 g/mol.

=  

= 0.322 mol (C2H5)2O

So, number of moles in 23.9 g of solid diethyl ether is 0.322 moles.

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