Question

How many joules of heat are absorbing when 70.0 g of water is completely vaporized at its boiling point?

Answer 1

Answer:

Ah the old heat of vaporization question, you have 70 g or 0.07kg water. At standard atmosphere the heat of vaporization is 2256.40 kJ/kg so at standard conditions it would take about 158 kJ to vaprize all the liquid.

Explanation:

Don't forget that this can vary widely depending . Generally speaking it will require more energy at lower pressures and less energy at higher pressures, at pressures above 22 MPa there actually is no heat of vaporization because there is no distinction between liquid and vapor water.