Răspuns:
36g C
Explicație:
Un mol de atomi conține 6,022•10²³ atomi (numărul lui Avogadro).
[tex]\rm 1\:mol\:C..........6,022\cdot10^{23}atomi\:C\\\rm x\:mol\:C..........18,069\cdot10^{23} atomi\:C[/tex] [tex]\rm\dfrac{1\:mol}{x\:mol}=\dfrac{6,022\cdot10^{23}atomi}{18,069\cdot10^{23}atomi}\Rightarrow x=\dfrac{18,069\cdot\sout{10^{23}atomi}\cdot 1\:mol}{6,022\cdot\sout{10^{23}atomi}}=3mol\:C[/tex]
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[tex]\boxed{\bf n=\dfrac{m}{A}}[/tex]
[tex]\bf n=numarul\:de\:mol\:(mol)[/tex]
[tex]\bf m=masa\:(g)[/tex]
[tex]\bf A=masa\:atomica\:(\dfrac{g}{mol})[/tex]
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[tex]\rm n_C=3mol[/tex]
[tex]\rm A_C=12\dfrac{g}{mol}[/tex]
[tex]\rm n=\dfrac{m}{A}\Rightarrow m_C=n_C\cdot A_C=3\sout{mol}\cdot 12\dfrac{g}{\sout{mol}}=36g[/tex]
Mult succes!
-Mihai
P.S. Glisează spre stânga dacă nu vezi tot răspunsul.
