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It assesses knowledge in subjects relevant to the candidate’s chosen course of study.","tags","utme jamb joint admission matriculation board unified tertiary matriculation examination nigeria africa","version","vip","location",{"_390":391,"_392":393},"type","Point","coordinates",[394,395],9.082,10.3671,"ng","priority",5,"createdOn",1755987353430,"updatedOn","questionsCount",29915,"courseCount",20,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_420":421,"_110":426},"AykU8JowEmWVqUuwjUDTIR0uvZriUx","q","An iron ore is known to contain 70.0% Fe₂O₃. The obtain from 80kg of the ore is?
\n
\n(Fe = 56, O = 16)","ans",[414],1,"1991","course","chemistry","exp","2Fe₂O₃ → 4Fe + 3O₂
\n320g 224g 96g
\n(70) / (100) x (80) / (1) 56g
\nif 0.32kg of Fe₂9₃ contains 0.224 kg
\nThen 56kg will contain (56 x 0.224) / (0.32) =39.2 kg","opts",[422,423,424,425],"35.0 kg","39.2 kg","70.0 kg","78.4 kg",3,"3","initComment","initReply","actionData","errors"]

JAMB - Chemistry (1991 - No. 3)

Explanation

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