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AbiusX · Answer 1 · 2019-06-09T03:05:14+0000

Coefficients in the chemical equation show ratio of moles of the reactants and products.
2KCLO3 ----> 3KCl +2O2
by reaction 2 mol 3 mol
from problem x mol 4.5 mol

x=(2*4.5)/3 =9/3 =3 mol of KClO3 are needed to form 4.5 mol KCl.

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