Question $1(1$ point$)$

A $1\mathrm{.}512-$gram piece of aluminum was burned in the presence of oxygen, forming $2\mathrm{.}857-$grams of the binary oxide compound. What mass of oxygen is present in the compound? Please report your answer with the correct number of significant figures and WITH units.

A

Question $2(1$ point$)$

A $0\mathrm{.}987-$gram piece of aluminum was burned in the presence of oxygen, forming $1\mathrm{.}865-$grams of the binary oxide compound. How many moles of aluminum are present in the compound? Please report your answer with the correct number of significant figures and WITH units $($mol$).$

$\sqrt[A]{?}$