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Three weighings are done in this experiment. The sequence of weighing is empty flask + foil; flask + foil after boiling water bath; flask +

Three weighings are done in this experiment. The sequence of weighing is empty flask + foil; flask + foil after boiling water bath; flask + foil + water to fill flask. Why is not weighing done when the unknown is initially added to the flask, before it is placed in the boiling water bath?

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