Answer: Option (a) is the correct answer.
Explanation:
Poly means many and polyatomic ions means an ion(s) with two or more different atoms.
Out of the given options, phosphate ion is the polyatomic ion which has an ionic charge of 3-.
The formula depicting a phosphate ion is .
Whereas Nitrate, Sulfate, Hydroxide , Bicarbonate does not carry or have a 3- ionic charge.
1.386 g of Mg ribbon combusts to form 2.309 g of oxide product. The mass percent of oxygen in the oxide is 40.0 %.
Let's consider the reaction for the combustion of Mg.
Mg + 1/2 O₂ ⇒ MgO
1.386 g of Mg combusts to form 2.309 g of MgO. We want to determine the mass of oxygen in MgO. According to Lavoisier's law of conservation of mass, matter is not created nor destroyed over the course of a chemical reaction. Then, the mass of Mg in the reactants is equal to the mass of Mg in MgO. The mass of the magnesium oxide is the sum of the masses of magnesium and oxygen. The <u>mass of oxygen in the oxide</u> is:
We can calculate the mass percent of O in MgO using the following expression.
You can learn more about mass percent here: brainly.com/question/14990953