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3 years ago

How does the law of conservation of mass apply to this reaction: Al + 3HCl → H2 + AlCl3 ?

Physics

2 answers:

11Alexandr11 [23.1K]3 years ago

8 0

Answer:

Only the hydrogen needs to be balanced. There are equal numbers of aluminum and chlorine.

Explanation:

I took the K12 test, listened to some other idiot and got it wrong, so this is the correct one.

Hope this helps!

melomori [17]3 years ago

3 0

Answer: Only the hydrogen needs to be balanced. There are equal numbers of aluminum and chlorine.

Explanation:

A balanced chemical equation always follow law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This also means that total number of individual atoms on reactant side must be equal to the total number of individual atoms on the product side.

For the given chemical equation, the balanced reaction follows:

$2Al+6HCl\rightarrow 3H_2+2AlCl_3$

On reactant side:

Number of aluminium atoms = 2

Number of hydrogen atoms = 6

Number of chlorine atoms = 6

On product side:

Number of aluminium atoms = 2

Number of hydrogen atoms = 6

Number of chlorine atoms = 6

Hence, only the hydrogen needs to be balanced. There are equal numbers of aluminum and chlorine.

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An electron accelerates through a 12.5 V potential difference, starting from rest, and then collides with a hydrogen atom, excit

Yanka [14]

Answer:

Initial state Final state

3 ⇒ 2

3 ⇒ 1

2 ⇒ 1

Explanation:

For this exercise we must use Bohr's atomic model

E = - 13.606 / n²

where is the value of 13.606 eV is the energy of the ground state and n is the integer.

The energy acquired by the electron in units of electron volt (eV)

E = e V

E = 12.5 eV

all this energy is used to transfer an electron from the ground state to an excited state

ΔE = 13.6060 (1 / n₀² - 1 / n²)

the ground state has n₀ = 1

ΔE = 13.606 (1 - 1/n²)

1 /n² = 1 - ΔE/13,606

1 / n² = 1 - 12.5 / 13.606

1 / n² = 0.08129

n = √(1 / 0.08129)

n = 3.5

since n is an integer, maximun is

n = 3

because it cannot give more energy than the electron has

From this level there can be transition to reach the base state.

Initial state Final state

3 ⇒ 2

3 ⇒ 1

2 ⇒ 1

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(15 Points)

oksian1 [2.3K]

The vertical weight carried by the builder at the rear end is F = 308.1 N

<h3>Calculations and Parameters</h3>

Given that:

The weight is carried up along the plane in rotational equilibrium condition

The torque equilibrium condition can be used to solve

We can note that the torque due to the force of the rear person about the position of the front person = Torque due to the weight of the block about the position of the front person

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Read more about vertical weight here:

brainly.com/question/15244771

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