To determine the melting point of an unknown substance from a heating diagram, you would typically look for the temperature at which the substance begins to change from a solid to a liquid. This is indicated by a plateau or flat line in the graph, where the temperature remains constant as the substance absorbs heat and undergoes the phase transition from solid to liquid.
If you have specific details about the diagram or data points, please provide them for a more accurate answer. Otherwise, you'll want to identify the temperature at the beginning of the phase change on the graph. This temperature is your melting point.
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