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Answer #1

Mass of empty Erlenmeyer flask= 85.35g

Mass of Erlenmeyer flask and Zn = 86.90g

So mass of Zn= 1.55g

Mass of Erlenmeyer flask and unreacted Zn= 86.56g

We know mass of empty flask = 85.35g

So, Mass of unreacted Zn = 1.21g

Mass of Zn reacted= 1.55g-1.21g = 0.34g

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