How much energy is required to melt a 20.0lb bag of ice a 0°c? a pound (lb.) is equivalent to 0.4536. the hfusion of ice is +6.009kj/mol.

To compute the energy, Q, needed to melt a certain amount of ice, n, in moles, we have



where the latent heat of fusion for ice is equal to 6.009 kJ/mol.

Now, since we have a 20.0 lb ice, we must first convert its mass to grams. Thus mass = (20.0)(1000)(0.4536) = 9072 g.

To find the number of moles present, we must recall that the molar mass of water (ice) is equal to 1.00794(2) + 15.9994 ≈ 18.01 g/mol. Hence, we have



Now, to compute for the molar heat of fusion, Q,



Therefore, the amount of heat needed to melt the 20-lb bag of ice is equal to 3026.9 kJ.
 
3026.9 kJ

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