Question
The law of conservation of mass states that mass is neither created nor destroyed during a chemical reaction. This can be gleaned from the third postulate in Datton's series. Magnesium cude decomposes into magnesium and oxygen. If 1209 g of magnesium axide decomposes to form 7.29 g of magnesium,what mass of oxygen gas is also released in the reaction? Express your answer with the appropriate units. View Available Hint(s) Units Submit
Answer
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Lawrence
Elite · Tutor for 8 years
Answer
The mass of oxygen gas released in the reaction is
.
Explanation
To solve this problem, we will apply the law of conservation of mass. This law implies that the total mass of the reactants in a chemical reaction must equal the total mass of the products. In this case, magnesium oxide (MgO) decomposes into magnesium (Mg) and oxygen (O₂). The mass of magnesium oxide before the reaction will be equal to the sum of the masses of magnesium and oxygen after the reaction.Given:- Mass of magnesium oxide (MgO) before decomposition:
- Mass of magnesium (Mg) after decomposition:
We need to find the mass of oxygen gas (O₂) released.Step 1: Write down the mass of magnesium oxide before decomposition.Step 2: Write down the mass of magnesium after decomposition.Step 3: Subtract the mass of magnesium from the mass of magnesium oxide to find the mass of oxygen released.Let's perform the calculation:Step 1: Mass of magnesium oxide (MgO) =
Step 2: Mass of magnesium (Mg) =
Step 3: Mass of oxygen (O₂) = Mass of MgO - Mass of MgMass of oxygen (O₂) =
-
Mass of oxygen (O₂) =