How much heat is required to vaporize 43.9 g of acetone at its boiling point?

The heat required to vaporize 43.9 g  of acetone  at its boiling point is calculated as  below

 the heat of vaporization of acetone at its boiling  point is  29.1 kj/mole

find the moles of  acetone = mass/molar mass
= 43.9g /58 g/mol =0.757 moles

heat (Q) = moles x heat of vaporization

= 29.1 kj/mole  x 0.757 moles = 22.03 kj

An indicator is a substance that undergoes a distinct noticeable change when conditions in its solution change. A dye in chemistry is a colored substance that has an affinity to the substrate to which it is being applied.