Conservation of Mass Chemistry Example 3

Follow the full solution, then compare it with the other examples linked below.

Example 3

easy
A student burns 1212 g of magnesium in air and obtains 2020 g of magnesium oxide. How much oxygen reacted?

Solution

  1. 1
    Mass of oxygen == mass of product −- mass of magnesium.
  2. 2
    20−12=820 - 12 = 8 g of oxygen.

Answer

8 g of oxygen8\,\text{g of oxygen}
The mass gained by magnesium comes entirely from the oxygen it combined with, demonstrating conservation of mass.

About Conservation of Mass

A fundamental law stating that in any chemical reaction, the total mass of all reactants exactly equals the total mass of all products, because atoms.

Learn more about Conservation of Mass →

More Conservation of Mass Examples

Example 1 easy

If [formula] g of hydrogen reacts with [formula] g of oxygen to form water, what is the total mass o

Example 2 medium

In a sealed container, [formula] g of calcium carbonate decomposes: [formula]. If [formula] g of CaO

Example 4 easy

If 12 g of magnesium reacts with oxygen to form 20 g of magnesium oxide in a closed container, how m

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