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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