5. How many cal are needed to bring 1750 g ice from -20.0 °C to steam at 110 °C? 10. Calculate the energy needed to heat 25 g water from 65 °C to steam at 145 °C.

Help with these questions thanks :)

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal