A substance \( A \) is mixed with equal quantities of the substance \( B \) and \( C \). At the ...

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A substance \( A \) is mixed with equal quantities of the substance \( B \) and \( C \). At the end of 1000 second, half of the mass of \( A \) has reacted. What fraction of \( A \) will be left unreacted at the end of 2000 second, if the reaction is (a) zero order with respect to \( A \) ? (b) IInd order with respect to \( A \) ?
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