determine the molecular formula of an oxide of iron in which the mass percent of iron and oxygen are 69.9 and 30.1 respectively.
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chemistry
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d jqvusxupduhiwhdoshcohefzihdihezcihezichec
dhdhdhjchchxhdjdududydy xboxic
nvkvmhd.hxjtdiydfzgnxgxhkxhas dyx
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