Question

Calculeaza masa de sulf necesara pentru a reactiona cu 150 g alumini. Ce masa de sulfura de aluminiu rezulta ?

Answer 1

Se da:

m(Al)=150g

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m(S)-?

m(Al2S3)-?

Rezolvare:

2Al+3S=Al2S3

v(Al)=150g/27g/mol=5,56mol

v(S)=5,56*3/2=8,34mol;

m=v*M;

m(S)=8,34mol*32g/mol=266,88g

stiind ca m(S)+m(Al)=m(Al2S3);

m(Al2S3)=266,88g+150g=416,88g;

Bafta!