Photos K O2

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K o2. K2cro4 h2so4. K2cro4 h2so4 k2cr2o7 k2so4 h2o. H2o2 h2so4 k2cr2o7 эфир. K2cro7 cr2 so4 2.
K2cro4 h2so4. K2cro4 h2so4 k2cr2o7 k2so4 h2o. H2o2 h2so4 k2cr2o7 эфир. K2cro7 cr2 so4 2.

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