CHEMISTRY HIGH SCHOOL

If 6.49 mol of ethane (C2H6) undergo combustion according to the unbalanced equationC2H6 + O2 −→ CO2 + H2O ,
how many moles of O2 is required?
1. 27.79
2. 7.63
3. 8.4
4. 25.48
5. 12.635
6. 21.035
7. 23.8
8. 19.04
9. 22.715
10. 26.775
Answer in units of mol.

Answers

Answer 1

Answer:

Answer:

22.715 moles of oxygen are used

Explanation:

Given data:

Number of moles of ethane = 6.49 mol

Number of moles of O₂ required = ?

Solution:

Chemical equation:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Now we will compare the moles of oxygen with ethane.

C₂H₆ : O₂

2 : 7

6.49 : 7/2×6.49 = 22.715 mol

Thus, 22.715 moles of oxygen are used.

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Answers

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In the reaction C + 02 - CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction? O 18 g O 54 g O 72 g 0 90 g

Answers

Mass of oxygen : 54 g

Further explanation

Conservation of mass applies to a closed system, where the masses before and after the reaction are the same

Reaction

$\tt C+O_2\rightarrow CO_2$

mass before reaction = mass after reaction

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Answers

Enthalpy refers to the total energy of a system. Hope this helped!

Answer: a. Enthalpy

Explanation:

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Answers

To solve this we must be knowing each and every concept related to element. Therefore, "all of the noble gas elements except neon have 8 electrons in their outermost energy level" is a false element.

What is element?

A chemical element represents a material that cannot be degraded chemically. Although chemical processes do not modify atoms, nuclear reactions can produce new elements.

Elements are classified according to the amount of protons they have. An element's atoms typically have the same amount of protons, but differing amounts of electrons or neutrons.

There are 118 recognized elements. Element 120.1 is being researched. When element 120 is created and validated, the periodic table must be updated to include it. A numerical subscript following an element in a chemical formula mean number of atoms. All of the noble gas elements except have 8 electrons in their outermost energy level.

Therefore, "all of the noble gas elements except neon have 8 electrons in their outermost energy level" is a false element.

To know more about element, here:

brainly.com/question/29545466

#SPJ2

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