Fe because oxidation mean loss of oxygen and Fe lose the oxygen so Fe is oxidised
2.1 billion years
2,139,000,000 to be exact
I did this before and i had got an A no it but its been along time tho
Density = mass / volume
= 69g / 23 ml
= 3 g / ml.
Thus, the density of the sample is 3 grams per ml or 3g/ ml
