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Ne4ueva [31]
3 years ago
11

What is percentage composition?

Chemistry
1 answer:
blondinia [14]3 years ago
7 0

Answer:

The percent composition of a component in a compound is the percent of the total mass of the compound that is due to that component. To calculate the percent composition of a component in a compound: Find the molar mass of the compound by adding up the masses of each atom.

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What mass in grams of ethylene oxide is needed to react with 18 g of water?
Savatey [412]
<span>C2H4O + H2O = C2H6O2 moles water = 18 g/ 18.02 g/mol=.998 the ratio is 1 : 1 : 1 moles C2H4O needed = 0.998 mass C2H4O = 0.998 mol x 44.053 g/mol = 44.00 g We require 44.00 g of ethylene oxide is needed to react with 18 g of water.</span>
7 0
3 years ago
How much heat is absorbed by 0.060 kg of copper when it is heated from 20.0°C to 80.0°C if the specific heat of copper is 385J/k
Elina [12.6K]

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its 1386J

Explanation:

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How many vibrational modes does ethanol have? Explain why.
Artyom0805 [142]

Answer:

The ethanol has 21 vibrational modes.

Explanation:

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In order to calculate the vibrational modes of a molecule we need to know the degrees of freedom of this molecule, it means the number of variables that are involved in the movement of this particle.

If we know that atoms are three dimensional we will know that they have 3 coordinates expressed as 3N. But the atoms are bonded together so they can move not only in translational but also rotational and vibrational. So, the rotational move can be described in 3 axes and the other vibrational move can be described as

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So using the formula for nonlinear molecules where N is the amount of atoms in the chemical formula, so ethanol has 9 atoms

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Thus, ethanol has 21 vibrational modes.

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Crude oil pumped out of the ground may be accompanied by formation water, a solution that contains high concentrations of nacl a
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= 4.49m

8 0
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