How many kJ is released when 3.4 mol of water is frozen?
q = mols H2O x heat fusion (in kJ/mol) = ?
q = 3.4 x 334 J/g
To calculate the amount of heat released when a substance freezes, we need to use the equation:
q = n * ΔHf
where q is the heat released in joules (J), n is the number of moles of the substance, and ΔHf is the molar enthalpy of fusion (heat of fusion) in joules per mole (J/mol).
The molar enthalpy of fusion for water is 6.01 kJ/mol (or 6010 J/mol). Therefore, we can use this value to calculate the heat released when 3.4 moles of water freeze.
First, convert 3.4 moles to joules using the conversion factor: 1 kJ = 1000 J
3.4 moles * (6010 J/mol) = 20474 J
Next, convert the result to kilojoules:
20474 J / (1000 J/kJ) = 20.47 kJ
Therefore, when 3.4 moles of water is frozen, approximately 20.47 kJ of heat is released.