Calculate the energy change when 50.0 g of water evaporates (Hyap = 2250 kJ/g). Molar mass for water 18 g/mol

Answer 1

To calculate the energy change when 50.0 g of water evaporates, we need to know the moles of water evaporated.

First, let's calculate the moles of water:

moles = mass / molar mass
moles = 50.0 g / 18 g/mol
moles = 2.778 mol

Next, let's calculate the energy change:

energy change = moles * heat of vaporization
energy change = 2.778 mol * 2250 kJ/mol
energy change = 5000 kJ

Therefore, the energy change when 50.0 g of water evaporates is 5000 kJ.