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8. A 10.0-g sample of magnesium reacts with oxygen to form 16.6 g of magnesium oxide. How many grams of oxygen reacted? 9. CHALLENGE 106.5 g of HCl(g) react with an unknown amount of NH (9) to produce 156.3 g of NH,Cl(s). How many grams of NH (9) reacted? Is the law of conservation of mass observed in the reaction? Justify your answer.
8. A 10.0-g sample of magnesium reacts with oxygen to form 16.6 g of magnesium oxide. How many grams of oxygen reacted? 9. CHALLENGE 106.5 g of HCl(g) react with an unknown amount of NH (9) to produce 156.3 g of NH,Cl(s). How many grams of NH (9) reacted? Is the law of conservation of mass observed in the reaction? Justify your answer.
Final answer:To find the mass of oxygen reacted, subtract the mass of magnesium from the mass of magnesium oxide. The law of conservation of mass is observed in the reaction.Explanation:To determine the mass of oxygen that reacted, we need to find the difference between the mass of magnesium oxide formed and the mass of magnesium used. The equation for the reaction is:2Mg + O2 → 2MgOThemolar massof Mg is 24.31 g/mol and the molar mass of MgO is 40.31 g/mol. Using these molar masses, we can calculate the amount of oxygen that reacted:Mass of MgO = 16.6 gMass of Mg = 10.0 gMass of oxygen reacted = Mass of MgO - Mass of Mg = 16.6 g - 10.0 g = 6.6 gThelaw of conservation of massstates that mass is neither created nor destroyed during a chemical reaction. In this reaction, the mass of oxygen reacted is equal to the difference in mass between the magnesium oxide formed and the magnesium used, demonstrating the conservation of mass.Learn more about Conservation of mass here:brainly.com/question/33386293#SPJ3...