How much energy is required to turn 18 g ice
at 261 k into steam at 444 k?

specific heat of ice = 2.077 j/g·k

specific heat of water (ℓ) = 4.180 j/g·k

specific heat of steam = 2.042 j/g·k

h2o heat of fusion = 6.00 kj/mol

h2o heat of vaporization = 40.6 kj/mol

answer in units of j.