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3 years ago

How many moles of sodium will react with water to produce 2.0 mol of hydrogen in the following reaction?

Chemistry

1 answer:

ser-zykov [4K]3 years ago

4 0

Answer: 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen

Explanation:

The balanced chemical equation is:

$2Na(s)+2H_2O(l)\rightarrow 2NaOH(aq)+H_2(g)$

According to stoichiometry :

1 mole of $H_2$ is produced by = 2 moles of $Na$

Thus 2.0 moles of $H_2$ are produced by = $\frac{2}{1}\times 2.0=4.0moles$ of $Na$

Thus 4.0 moles of sodium will react with water to produce 2.0 mol of hydrogen

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How might scientific knowledge about monoculture farming affect societal decisions? Please be sure to answer in complete sentenc

alisha [4.7K]

Answer:

in monoculture farming , we produce a single species of a livestock or plant in large quantity.

Even though it is very effective, producing a mass number of a single organism in an Area will risk of endangering the existence of a specific nutrient ( because that large number of organism is basically eating the same thing)

which lead to societal decision such as the founding of The Livestock conservancy, or other environmental protection organization

Explanation:

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3 years ago

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What is the main difference between gravitational potential energy and elastic potential energy?

Genrish500 [490]

Answer:

An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height. An object possesses elastic potential energy if it is at a position on an elastic medium other than the equilibrium position.

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3 years ago

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study the diagram and answer the following questions. a. Name A and B. b. Which element is it? Write its name and B symbol. p*=

Oksana_A [137]

Ai. A is called nucleus

Aii. B is called electron shell

B. The name of the element is Neon and the symbol of the element is Ne.

Ci. The atomic mass of the element is 20.

Cii. The atomic number of the element is 10

Di. The element belongs to group 18.

Dii. The element belongs to period 2.

E. The element has a valency of 8

A. Determination of the name of A and B

In the diagram given above, A is called the nucleus because it contains the neutrons and the protons of the atom.

B is called the electron shell because it contains the electrons of the atoms

B. Determination of the name and symbol of the element.

From the diagram given above,

The element has 10 protons. This simply means that the atomic number of the element is 10.

Comparing the atomic number of the element with those in the periodic table, the element is Neon with a symbol of Ne.

C. Determination of the atomic mass and atomic number.

Ci. Determination of the mass number

Proton = 10

Neutron = 10

<h3>Mass number =?</h3>

Mass number = Proton + Neutron

Mass number = 10 + 10

<h3>Mass number = 20</h3>

Thus, the atomic mass of the element is 20.

Cii. Determination of the atomic number.

The atomic number of an element is simply the number of protons in the atom of the element.

Proton = 10

Therefore,

Atomic number = proton = 10

Thus, the atomic number of the element is 10

D. Determination of the group and period.

Di. The group to which an element belongs to can be obtained by simply calculating the number of electrons in the outermost shell of the atom.

From the diagram given above, the outermost shell has 8 electrons. This suggest that the element has completely filled outermost shell.

Therefore, the element belongs to group 18 (i.e the noble gas)

Dii. The number of electron shell talks about the period to which and element belongs to.

From the diagram given above, the element has 2 electron shells.

Therefore, the element belongs to period 2

E. Determination of the valence electron(s)

The valence electron(s) is the number of electrons in the outermost shell of the atom.

From the diagram given above,

The outermost shell has 8 electrons.

Therefore, the element has 8 valence electrons

Learn more: brainly.com/question/5352570

3 0

2 years ago

Simple diffusion is defined as the movement of

wolverine [178]

<h2>Simple diffusion is defined as the movement of: A molecules from areas of higher concentration to areas of lower concentration.</h2>

Explanation:

Diffusion

It is the movement of substances from the region of higher concentration to lower concentration .

This diffusion is shown almost negligible by solids , a little by liquids and maximum by gases .

The factors on which diffusion depends :

Inter-molecular force between particles : It is inversely proportional to diffusion .That is : more is the force , lesser the diffusion rate
Inter-molecular space between particles : More is the space , more is the diffusion or vice versa .
Density of substance :More is the density , less is the diffusion or vice versa .

Applications of diffusion

It helps in the movement of substance in and out from the cell and its components .

It helps in spreading the fragrance when sprayed with some perfume etc .

It helps in dissolving substance in any medium

Etc

5 0

3 years ago

The common laboratory solvent benzene is often used to purify substances dissolved in it. The vapor pressure of benzene , C6H6,

Sidana [21]

Answer: Molecular weight of this compound is 387.3g/mol

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

$\frac{p^o-p_s}{p^o}=i\times x_2$

where,

$\frac{p^o-p_s}{p^o}$ = relative lowering in vapor pressure

i = Van'T Hoff factor = 1 (for non electrolytes)

$x_2$ = mole fraction of solute = $\frac{\text {moles of solute}}{\text {total moles}}$

Given : 18.16 g of compound is present in 228.6 g of benzene

moles of solute = $\frac{\text{Given mass}}{\text {Molar mass}}=\frac{18.16g}{Mg/mol}$

moles of solvent (benzene) = $\frac{\text{Given mass}}{\text {Molar mass}}=\frac{228.6g}{78g/mol}=2.93moles$

$x_2$ = mole fraction of solute = $\frac{\frac{18.16g}{Mg/mol}}{\frac{18.16g}{Mg/mol}+2.93}$

$\frac{73.03-71.88}{73.03}=1\times \frac{\frac{18.16g}{Mg/mol}}{\frac{18.16g}{Mg/mol}+2.93}$

$M=387.3g/mol$

The molecular weight of this compound is 387.3g/mol

6 0

3 years ago