1 atom of iron weighs
a) 8 x 10-23g
3.3
b) 4.5
Che number of moles in
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[tex]\documentclass{standalone}
\usepackage{tkz-euclide}
\begin{document}\begin{tikzpicture}
%def
\tkzDefPoints{0/0/A,7/0/B}
\tkzDefPoint(49:5){C}
% draw
\tkzDrawPolygon(A,B,C)
\tkzDrawPoints(A,B,C)
%marks
\tkzMarkAngle[size=1.3cm](B,A,C)
%label
\tkzLabelSegment[below](A,B){$ 7 $}
\tkzLabelSegment[left](A,C){$ 5 $}
\tkzLabelSegment[right](B,C){$ a $}
\tkzLabelAngle[pos = 0.8](B,A,C){$49^\circ$}
\tkzLabelPoints(A,B)
\tkzLabelPoints[above](C)
\end{tikzpicture}
\end{document}[/tex]
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