1 Given the constants below, calculate how much energy in Joules would be required to change 100.0 g liquid water at 100oC into steam, also at 100oC. SHOW ALL WORK

Question

Given the constants below, calculate how much energy in Joules would be required to change 100.0 g liquid water at 100oC into steam, also at 100oC.

zoom_in

Answer 1

The process of changing water at 100ºC to steam at 100ºC requires only a phase change, with NO CHANGE in temperature. For this particular phase change, we want to use the ∆Hvap value which is the amount of energy needed to change liquid water into gaseous water (steam). This value is given as 2259.36 J/g. Since we have 100.0 g the calculation looks like this...

2259.36 J/g x 100.0 g = 225,936 J (answer)