Write the electron configuration of the element that has Z = 3 *

5. In an oxyacetylene welding torch, acetylene (C2H2) burns in pure oxygen with a very hot flame. The reaction is: 2 C2H2 + 5 O2

gulaghasi [49]

11.375 g ethylene is consumed if 35.0 grams of oxygen is allowed to react and 7.875 ml of water will be produced when the 35.0 grams of oxygen is allowed to react.

<h3>What are moles?</h3>

A mole is defined as 6.02214076 × $10^{23}$ of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

According to the chemical equation for the combustion of ethylene, 5

moles of oxygen are required to react with 2 moles of ethylene, hence

$m_{_C_2_H_2}$ $= 35gX \frac{1 mol}{(2 \;X\; 16)g } X \frac{2 mol}{(5\;mol )} X \frac{26g}{1 mol }$

$m_{_C_2_H_2} = 11.375 g$

Similarly, 5 moles of oxygen are required as a reactant to produce 2 moles of water, thus

$m_{_H_2_O} = 35gX \frac{1 mol}{(2 \;X\; 16)g } X \frac{2 mol}{(5\;mol )} X \frac{18g}{1 mol }$

$m_{_H_2_O} = 7.875 g$

Given that the density of water is $1.0g ml^{-1}$ , therefore

$Density = \frac{Mass \;of \;water}{Volume \;of \;water}$

$Volume \;of \;water = \frac{7.875}{1.0 g ml^{-1}}$

The volume of water = 7.875 ml

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5 0

2 years ago

Read 2 more answers

Why doesnt the number of neutrons identify an element

Goryan [66]

You look at the atomic mass.. The number of neutrons is different for different individual atoms of the same element, each atom is also known an isotope. Looking at a periodic table, the atomic mass listed is the average atomic mass for all isotopes of that element found in nature.

8 0

4 years ago

Which transformation could take place at the anode of an electrochemical cell? Which transformation could take place at the anod

mr_godi [17]

Answer:

None of the above could take place at the anode.

Explanation:

In a cell, a redox reaction takes place, so one substance must reduce (gain electrons), and others must oxidize (lose electrons). At the anode, the substance oxidizes, and at the cathode the substance reduces.

Thus, we need to find what transformation oxidation is happening. To this, let's calculate the oxidation number (nox) of the atoms. If it's increasing, and oxidation is happening, if it's decreasing, a reduction is happening.

O₂ to H₂O:

O2 is a simple substance, so it has nox = 0. In a compound, O has nox -2 and H +1, so the nox of O is decreasing.

Cr₂O₇⁻² → Cr⁺²:

O has nox -2, so let's call the nox of Cr as x:

2x +7*(-2) = -2

2x -14 = -2

x = +6

And Cr⁺² has nox +2, so it's reducing.

F₂ to F⁻:

F₂ is a simple substance, so F has nox 0, and F⁻ has nox -1, then it's reducing.

HAsO₂ to As:

H has nox +1, and O has nox -2, so calling x the nox of As:

+1 + x + 2*(-2) = 0

1 + x - 4 = 0

x = +3

And As is a simple substance, that has nox 0, the it's reducing.

Thus, none of them is oxidizing, and none of them could take place at the anode.

6 0

3 years ago

2

Gemiola [76]

Answer:

the physical and chemical properties of the products are different from the reactants

Explanation:

A chemical reaction involves the chemical combination of two or more elements/compounds called Reactants to give one or more different elements/compounds called Products. A chemical reaction occurs in such a way that the atoms of the reactants are restructured to form product(s) that is/are entirely different from the reactants.

In a chemical reaction, the physical and chemical properties of the products differ from that of the reactants since different chemical compounds/elements are formed as products. The physical properties of a substance, which include colour, melting and boiling point etc. will differ in the reactants and products formed. Also, the chemical structure and identity of the reactants will be changed to give rise to a different chemical property in the products.

7 0

3 years ago

The setup in the diagram is left outside during the day and night . Bubbles are continuously produced regardless of the presence

Angelina_Jolie [31]

Answer:

A

Explanation:

6 0

3 years ago