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cho 17 64 gam k2cr2o7
cho 12 25 gam kclo3
cho 17 4 gam mno2
cho 14 2 gam p2o5
cho 7 1 gam p2o5
cho 2 16 gam mg
ki + k2cr2o7 + h2so4
os of cr in k2cr2o7
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