Question

How many grams of water will be produced when 1.6 moles of ethanol (CH3CH2OH) are burned completely? Enter a number only (no units) and express your answer using the correct number of significant figures.

Answer 1

Answer:

86

Explanation:

The reaction that takes place is:

• C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

First we convert moles of ethanol to moles of water:

• 1.6 mol ethanol * $\frac{3molH_2O}{1molEthanol}$ = 4.8 mol H₂O

Then we convert moles of water to grams of water, using its molar mass:

• 4.8 mol H₂O * 18 g/mol = 86.4 g

So 84.6 grams of water will be produced.