How much heat in KJ is needed to change 3.0 kg of ice at -10C into (superheated) steam at +150C ?

Answer 1

I will be happy to critique your thinking. Add the following heats:
heat to melt ice
heat to warm water to 100C
heat to change water to steam
heat to heat steam to 150C

Answer 2

heat to melt ice 2100 kj
liquid 4186 kj
steam 2010 kj
heat to heat steam 301.5 kj