How do you determine the total mechanical energy stored of an object
1 answer:
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Answer:
- <u><em>Last choice: 109.729 g</em></u>
Explanation:
This is a combustion reaction. The complete combustion of a hydrocarbon produces carbon dioxide and water.
The combustion reaction of<em> isopropyl alcohol</em> is represented by the balanced hemical equation:
Thus, 2 moles of produce 8 moles of
.
<u>1. Convert the 91.5 g of isopropyl alcohol into number of moles</u>
- Number of moles = molar mass / fomula mass
- Formula mass
- Number of moles = 91.5g / (60.95592g/mol) = 1.52256692 mol
<u>2. Calculate the the number of moles of water produced using the mole ratio:</u>
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<u>3. Convert to mass of water</u>
- Mass = number of moles × molar mass
- Molar mass = 2 × 1.00794 g/mol + 15.9994g/mol = 18.01528g/mol
- Mass = 6.0902637 mol × 18.01528 g/mol = 109.717806g ≈ 109.72 g
So far, I have kept a large number of digits because these are intermediate calculations.
You should report the result with 3 significant figures, but all the answer choices contain more than that.
The last choice, 109.729, is the closest to the correct value.