### Video Transcript

The diagram shows the element
carbon and a molecule of oxygen reacting to form carbon dioxide. Given the relative atomic and
formula masses given in the diagram, what would you expect the relative formula mass
of carbon dioxide to be?

We are given a diagram representing
a chemical reaction. The first reactant is the element
carbon, which has the chemical symbol C. It reacts with oxygen, which has
the chemical formula O2. This reaction forms one product,
which is carbon dioxide, which has the chemical formula CO2. We can see that the relative atomic
mass of carbon is 12. The relative formula mass of oxygen
is 32.

We must find the expected relative
formula mass of carbon dioxide. To do this, we can use the law of
conservation of mass. This law states that mass is
neither created nor destroyed in a chemical reaction. This means that the total mass of
the reactants must be equal to the total mass of the products after the reaction
occurs.

We know that the total relative
mass of the reactants, carbon and oxygen, will be the sum of the relative atomic and
formula masses. This will be the sum of 12 and
32. This sum, according to the law of
conservation of mass, must be equal to the relative mass of the products, which we
can set as our unknown 𝑥. When we add 12 plus 32, we get
44. This is the total relative mass of
the reactants, and so this must also be the total relative mass of the products. Thus, 𝑥 is equal to 44.

There is only one product, carbon
dioxide, so this must be the relative formula mass of carbon dioxide. We have found the answer to this
question. We would expect the relative
formula mass of carbon dioxide to be 44.