According to the Law of conservation of mass, the grams of oxygen formed are A) 0.7 g.
Explanation:
According to the Law of conservation of mass, the total mass of the products in a chemical reaction must be equal to the total mass of the reactants.
In this problem, the chemical reaction is:
[tex]HgO \rightarrow Hg + O[/tex]
where
[tex]HgO[/tex] is the mercuric oxide
Hg is the liquid mercury
O is the oxygen
We have the following data:
[tex]m(HgO) = 10 g[/tex] (mass of mercuric oxide)
[tex]m(Hg) = 9.3 g[/tex] (mass of liquid mercury)
Since the mass of the products must be equal to the mass of the reactant (the HgO), we can find the mass of the oxygen produced:
[tex]m(O) = m(HgO)-m(Hg)=10 g - 9.3 g = 0.7 g[/tex]
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