Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.
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Speed is the rate at which something goes, and velocity is the average acceleration, which means a car can go slow for a bit, and fast for a bit, and have a velocity of medium. Also, speed is much easier to measure.
Answer:
1.8 x 10^ 24 atoms of oxygen
Explanation:
The molecular weight of ozone is known to be 48 grams / mol. Here we are given a sample of 48 grams of ozone as well, so in 48 grams of ozone the number of moles = 48 / 48 = 1,
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1 mole of ozone is equal to 6.0221415 × 10^23 molecules of ozone. Respectively, 1 molecule of ozone has 3 atoms of oxygen. Thus, you can conclude the following -
3 * 6.0221415 × 10^23 = ( About ) 1.8 x 10^ 24 atoms of oxygen
<u><em>Hope that helps!</em></u>
Which type of solution are you talking about?
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:
![2C_3H_8O+9O_2\rightarrow 6CO_2+8H_2O](https://tex.z-dn.net/?f=2C_3H_8O%2B9O_2%5Crightarrow%206CO_2%2B8H_2O)
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
![3\times 12.011g/mol+8\times 1.00794g/mol+1\times 15.9994g/mol=60.09592g/mol](https://tex.z-dn.net/?f=3%5Ctimes%2012.011g%2Fmol%2B8%5Ctimes%201.00794g%2Fmol%2B1%5Ctimes%2015.9994g%2Fmol%3D60.09592g%2Fmol)
- 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>
![\dfrac{8molH_2O}{2molC_3H_8O}\times 1.52256692molC_3H_8O=6.0902637molH_2O](https://tex.z-dn.net/?f=%5Cdfrac%7B8molH_2O%7D%7B2molC_3H_8O%7D%5Ctimes%201.52256692molC_3H_8O%3D6.0902637molH_2O)
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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.