At 1 atm, how much energy is required to heat 35.0 g of H2O(s) at –12.0 °C to H2O(g) at 127.0 °C?

Answer 1

Do this in steps and add each step to find total q.
1. Within a phase the formula is
q = mass x specfic heat x (Tfinal-Tinitial).
For example to heat 20g liquid water at zero C to 100 C (all in the same phase)
q = 20 x specific heat x (100-0) = ?

2. At the phase change (solid to liquid or liquid to vapor) it is
q = mass x heat fusion at freezing point or
q = mass x heat vaporization at the boiling point.
Then add the q values together to find the total.