Reply to "such a quantity"

(a) seems wrong to me because, unlike chemicals which can be found to be mixed in a mass of chemical substances, thus allowing for the use of "amount," books don't lose their individual appearance and separate existence.

In (b) -- which is correct -- "quantity" is synonymous with "number." Of course, the more the books, the heavier they will be and the larger the space they will take up, but to me "quantity" clearly refers to their number in the case of books or similar individual items.

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