The graph shows a heating curve for water. Which point on the graph indicates that all of the liquid water has been converted to water vapor?

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4

Explanation:

water starts to boil into water vapor at 100'C. at this point, temperature becomes costant at 100'C as heat energy is used up by the particles to overcome the intermolecular forces between the molecules.

once the forces holding the particles together have been overcome, the temperature will start to rise again showing that all the liquid water has been converted into water vapor