3. Combustion du magnésium On enflamme un ruban de magnésium de 6 g de masse. On arrête la réaction et on
pèse la masse de la poudre blanche formée. On retrouve 8g.
a. Illustrer la réaction par l'équation et nommer les réactifs et les produits.
b. Calculer la masse de magnésium brûlée.
c. Quelle quantité (en mol) d'air est encore nécessaire pour brûler tout le ruban de
magnésium.
Données : Masses molaires atomiques dans CNTP en g/mol : M(O) = 16
M(Mg)=24
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give me abc and i will get it for u.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.