Question 1

Which of the following is the correctly balanced equation for the complete combustion of ethanol ($$\mathrm{C_2H_5OH}) in $$oxygen?

Accepted Answer

$$\mathrm{C_2H_5OH} + 3\ O_2$ \rightarrow 2\ CO_2$ + 3\ H_2O$$

Question 2

What is the molar mass of ethanol ($$\mathrm{C_2H_5OH}$$)?

Accepted Answer

$$46.07\ \mathrm{g/mol}$$

Question 3

If 10.0 g of ethanol ($$\mathrm{C_2H_5OH}) is $$completely combusted, how many moles of ethanol are used? (Molar mass of ethanol = $$46.07\ \mathrm{g/mol})$$

Accepted Answer

$$0.217\ \mathrm{mol}$$

Question 4

Using the balanced equation $$\mathrm{C_2H_5OH} + 3\ O_2$ \rightarrow 2\ CO_2$ + 3\ H_2O$$, how many moles of $$\mathrm{CO_2$}$$ are produced per mole of ethanol combusted?

Accepted Answer

2

Question 5

Calculate the mass of $$\mathrm{CO_2$}$$ produced when 10.0 g of ethanol is completely combusted. (Molar mass of $$\mathrm{CO_2$}$$ = $$44.01\ \mathrm{g/mol})$$

Accepted Answer

$$19.1\ \mathrm{g}$$

Question 6

Which of the following steps is NOT required when calculating the mass of $$\mathrm{CO_2$}$$ produced from the combustion of ethanol?

Accepted Answer

Calculating the volume of $$\mathrm{CO_2$} at $$STP

Question 7

A student claims that burning 10.0 g of ethanol will produce 10.0 g of $$\mathrm{CO_2$}. $$Which concept did the student misunderstand?

Accepted Answer

Law of conservation of mass and stoichiometry

Question 8

If only 5.0 g of ethanol is combusted instead of 10.0 g, what mass of $$\mathrm{CO_2$}$$ would be produced? (Molar mass of ethanol = $$46.07\ \mathrm{g/mol}$$, $$\mathrm{CO_2$}$$ = $$44.01\ \mathrm{g/mol})$$

Accepted Answer

$$9.55\ \mathrm{g}$$

Question 9

Which of the following best describes the role of oxygen in the combustion of ethanol?

Accepted Answer

It acts as the oxidizing agent, accepting electrons from ethanol.

Question 10

In a real-world scenario, why might the actual mass of $$\mathrm{CO_2$}$$ produced from burning 10.0 g of ethanol be less than the theoretical value?

Accepted Answer

Incomplete combustion or loss of products during the reaction

Question 11

Which of the following is the correct sequence of steps to calculate the mass of $$\mathrm{CO_2$}$$ produced from a given mass of ethanol?

Accepted Answer

Convert grams of ethanol to moles, use mole ratio to find moles of $$\mathrm{CO_2$}$$, convert moles of $$\mathrm{CO_2$} to $$grams

Question 12

If the combustion of ethanol is performed in a closed system with limited oxygen, which product is likely to form in addition to $$\mathrm{CO_2$}$$ and $$\mathrm{H_2O}$$?

Accepted Answer

$$\mathrm{CO} ($$carbon monoxide)

Combustion of Ethanol: Equation Balancing and Stoichiometric Calculations

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