Răspuns :
[tex]m_S=3 \ g \\ c=1,7\% \\ c=\frac{m_C}{m_S}\cdot 100\% \\ \Rightarrow \frac{m_C}{3 \ g} \cdot 100\%=1,7\% \\ \Rightarrow m_C=\frac{3 \ g \cdot 1,7}{100}=\frac{5,1 \ g}{100} \\ \Rightarrow \boxed{m_C=0,051 \ g}[/tex]
Răspuns:
ms=3g
C=1,7%
mcarbon=?
md= C× ms/100=3×1,7/100=0,051g
mcarbon=0,051g