Bonjour, j'ai un exercice mais je ne comprends pas, pourriez-vous m'aider stp.

la réaction entre la craie et l'acide chlorhydrique produit un gaz. Avant réaction, on réalise la pesée schématisée ci-contre.

a:312g b:306g c:302g
sachant que l'acide chlorhydrique et le calcaire pèse 306g

Parmi les trois schémas, quel est celui qui représente correctement ce que l'on observe après avoir introduit le calcaire dans l'acide?​

that's what i got you can count the number of atoms

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.