To calculate the energy change when 50.0 g of water evaporates, we can use the formula:
Energy change = mass * heat of vaporization
First, let's convert the mass of water from grams to moles using the molar mass of water (18 g/mol):
50.0 g / 18 g/mol = 2.78 mol
Now, let's calculate the energy change using the heat of vaporization (Hyap) and the number of moles:
Energy change = 2.78 mol * 2250 kJ/g
To cancel out grams, we need to convert grams to kilograms:
50.0 g = 50.0 g * (1 kg / 1000 g) = 0.05 kg
Now, calculate the energy change:
Energy change = 2.78 mol * 2250 kJ/g * 0.05 kg
Energy change = 312.75 kJ
Calculate the energy change when 50.0 g of water evaporates (Hyap = 2250 kJ/g). Molar mass for water 18 g/mol
in simple steps
1 answer