Calculating Masses In Reactions

The video tutorial explains the principle of mass conservation in chemical reactions using examples of coal and methane combustion. It guides viewers through calculating the mass of products formed, emphasizing the importance of balanced chemical equations and molar mass calculations. The tutorial provides a step-by-step approach to solving these problems, ensuring the mass of reactants equals the mass of products.

What is the fundamental principle regarding mass in chemical reactions?

• Mass is created during reactions.

• Mass is destroyed during reactions.

• Mass is irrelevant in reactions.

• Mass is conserved during reactions.

In the combustion of methane, what is the ratio of methane molecules to water molecules produced?

• 2:2

• 2:1

• 1:2

• 1:1

What is the molar mass of methane (CH4)?

• 20 grams

• 18 grams

• 16 grams

• 12 grams

How many grams of water are produced from the combustion of 1000 grams of methane?

• 1000 grams

• 2500 grams

• 1800 grams

• 2250 grams

What is the molar mass of two moles of water?

• 18 grams

• 32 grams

• 36 grams

• 40 grams