How much energy is required to melt these quantities of ice?

a. 56 g

b. 56 mol

The enthalpy is the amount of energy required to change from solid to liquid.

The molar enthalpy of fusion (kJ/mol) is 6.01 kJ/mol.

We can answer B first, since solving for A would require us to find moles, which takes more time.

q = H*n

q = 6.01*56

q = 336.56 kJ

On to a.

Since we know the molar enthalpy of fusion, we need to solve for the number of moles in 56 grams of ice.

n = 56 / (16.00 + 2 (1.008))

n = 3.108 mol

Now we can solve.

q = H * n

q = 6.01 * 3.108

q = 18.7 kJ

Answers:

a. 18.7 kJ

b. 336.56 kJ

Let me know if you'd like me to explain anything I did here.

-T. B.