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7. How much thermal energy is absorbed when 10.0 g of ice at 0.0 degrees C changes phase to liquid water at 0.0 degrees C? The molar mass, M, of water is 18.02 g/mol and the theoretical heat of fusion, Hfus, of water is 6.01 kJ/mol

Respuesta :

skyluke89

Answer:

3.34 kJ

Explanation:

FIrst of all, we need to calculate the number of moles corresponding to 10.0g of ice. This is given by

[tex]n=\frac{m }{M_m}[/tex]

where

[tex]M_m = 18.02 g/mol[/tex] is the molar mas

m = 10.0 g is the mass

Substituting

[tex]n=\frac{m}{M_m}=\frac{10 g}{18.02 g/mol}=0.555 mol[/tex]

Now we know that the heat of fusion is

[tex]H_{fus}=6.01 kJ/mol[/tex]

so the thermal energy needed to fuse the ice is

[tex]Q=n H_{fus} = (0.555 mol)(6.01 kJ/mol)=3.34 kJ[/tex]