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Comets are usually formed of ice and other suave debris, while asteroids typically contain metals.
Yes.
A covalent bond holds it together, which is chemical.
3.46 g Cu 1 mol Cu 6.02*10^23 atoms Cu =
63.55 g Cu 1 mol Cu
3.28*10^22 atoms Cu
M1Xv1=M2XN2
.0MX.02L=M2X.02L
M2=.002/.01
M2 =0.2