Question Video: Calculating the Relative Formula Mass of Carbon Dioxide | Nagwa Question Video: Calculating the Relative Formula Mass of Carbon Dioxide | Nagwa

# Question Video: Calculating the Relative Formula Mass of Carbon Dioxide Science • First Year of Preparatory School

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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?

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### 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.

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