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Amount of substance (mole) calculationsHigh frequency

10-question practice

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Question 1 of 7

(Relative atomic masses: C 12, O 16, Ca 40)

16.0\ \mathrm{g}

of a mixture of

\mathrm{Fe_2O_3}

and

\mathrm{CuO}

is completely reduced to the metals by excess CO on heating. All the

\mathrm{CO_2}

formed is passed into excess clear limewater, giving

25.0\ \mathrm{g}

of white precipitate. The total mass of metal obtained is ( ).

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