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Big thanks to KamiYasha for all the help on this.

The volume of all of the oceans of the world is about 1,335,000,000 km^3 = 1,335,000,000,000,000,000 m^3

Density of Water = 1000 kg/m^3

Mass = Density * Volume = 1000 * 1335000000000000000 = 1.335e+21 kg

Freezing the Ocean:

ΔΤ = 15C

Specific Heat Capacity:

Q1 = mc(ΔΤ)

Q1 = (1.335e+21 kg)(4186 J/kg)(15)

Q1 = 8.382465e+25 joules

Latent Heat of Fusion:

Q2 = ML

Q2 = (1.335e+21 kg)(334000 J/kg)

Q2 = 4.4589e+26 Joules

Add Em' Together:

Q1 + Q2 = 8.382465e+25 + 4.4589e+26 = 5.2971465e+26 Joules or 126 Petatons

Multi-Continent level

Vaporizing the Ocean:

m = Mass

c = Specific Heat Capacity (Specific Heat Capacity of Water is 4186)

ΔΤ = Change in Temperature = Tf* - Ti* = 100 - 20 = 80

L = Latent Heat (vaporization) (In this case it would be 2.264e+6 J/kg)

Q = m*(c*ΔΤ+L)

Q = 1.335e+21 * (4186 * 80 + 2.264e+6)

Q = 3.4695048e+27 Joules or 829 Petatons

Multi-Continent level