How much energy is released when 37.8 g of water freezes? the heat of fusion for water is 6.02 kj/mol. the amount of heat energy released = kj?

Question

Chemistry

Ana Coleman

14 April, 13:00

How much energy is released when 37.8 g of water freezes? the heat of fusion for water is 6.02 kj/mol. the amount of heat energy released = kj?

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Ibarra · Answer 1

Answer is: 12.642 kJ of heat is released.

m (H₂O) = 37.8 g; mass of water.

M (H₂O) = 2 · 1 g/mol + 16 g/mo = 18 g/mol.

n (H₂O) = m (H₂O) : M (H₂O).

n (H₂O) = 37.8 g : 18 g/mol.

n (H₂O) = 2,1 mol; amount of substance.

ΔHfus = 6.02 kJ/mol; the heat of fusion.

Q = n (H₂O) · ΔHfus.

Q = 2.1 mol · 6.02 kJ/mol.

Q = 12.642 kJ.