Combustion Reactions and Stoichiometry

The video tutorial covers two chemistry problems. The first problem involves a combustion reaction where ethanol reacts with oxygen to produce water and carbon dioxide. The solution uses the law of conservation of mass to find the mass of carbon dioxide produced. The second problem involves chloroform samples, where the law of definite proportions is applied to determine the mass of chlorine and hydrogen in a second sample based on the mass of carbon. Basic algebra skills are used to solve both problems.

In a combustion reaction, 46.0 g of ethanol reacts with 96.0 g of oxygen. If 54.0 g of water is produced, what is the mass of carbon dioxide produced?

• 46.0 g

• 96.0 g

• 54.0 g

• 88.0 g

What principle is used to determine the mass of carbon dioxide produced in the combustion reaction?

• Law of Definite Proportions

• Law of Conservation of Mass

• Avogadro's Law

• Boyle's Law

In the chloroform problem, if a second sample contains 30.0 g of carbon, how many times larger is this compared to the original sample?

• 3.0 times

• 2.5 times

• 2.0 times

• 1.5 times

Using the law of definite proportions, how much chlorine is in the second chloroform sample if it contains 30.0 g of carbon?

• 53.2 g

• 133.0 g

• 266.0 g

• 106.4 g

What is the mass of hydrogen in the second chloroform sample if it contains 30.0 g of carbon?

• 1.01 g

• 3.03 g

• 2.53 g

• 5.05 g