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