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4 years ago

Given the following equation: 2 K3N ---> 6 K + N2

1 answer:

3 0

In a chemical equation, the digits written with each compound show the number of molecules of that compound reacting with other compounds. The reaction consumes and produces compounds in the same proportion as shown by the equation. So, as per given equation 2 moles of K3N will produce 1 mole of N2, hence 12 moles of K3N will produce 6 moles of N2.

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Balance the following skeleton reaction and identify the oxidizing and reducing agents: Include the states of all reactants and

rusak2 [61]

Answer:

$4Zn_(_s_)~+~7OH^-~_(_a_q_)~+~NO_3^-_(_a_q_)~+~6H_2O_(_l_)~-->4Zn(OH)_4^-^2_(_a_q_)~+~NH_3_(_g_)$

-) Oxidizing agent: $NO_3^-_(_a_q_)$

-) Reducing agent: $Zn_(_s_)$

Explanation:

The first step is separate the reaction into the semireactions:

A. $Zn~->Zn(OH)_4^-^2$

B. $NO_3^-~->~NH_3$

If we want to balance in basic medium we have to follow the rules:

1. We adjust the oxygen with $OH^-$

2. We adjust the H with $H_2O$

3. We adjust the charge with $e^-$

Lets balance the first semireaction A. :

$Zn~+~4OH^-~->Zn(OH)_4^-^2~+~2e^-$

Now, lets balance semireaction B:

$NO_3^-~+~8e^-~+~6H_2O~->~NH_3~+~9OH^-$

Finally, we have to add the two semireactions:

_________________________________________

$8~(Zn~+~4OH^-~->Zn(OH)_4^-^2~+~2e^-)$

$2~(NO_3^-~+~8e^-~+~6H_2O~->~NH_3~+~9OH^-)$

_________________________________________

$(8Zn~+~32OH^-~->8Zn(OH)_4^-^2~+~16e^-)$

$(2NO_3^-~+~16e^-~+~12H_2O~->~2NH_3~+~18OH^-)$

Cancel out the species on both sides:

$8Zn~+~14OH^-~+~2NO_3^-~+~12H_2O~-->8Zn(OH)_4^-^2~+~2NH_3$

Simplifying the equation :

$4Zn~+~7OH^-~+~NO_3^-~+~6H_2O~-->4Zn(OH)_4^-^2~+~NH_3$

The $Zn_(_s_)$ is oxidized therefefore is the reducing agent. The $NO_3^-_(_a_q_)$ is reduced therefore is the oxidizing agent.

4 0

4 years ago

A concrete barrier in a parking lot a structure of mass, frame, or shell? Which one would it be?

slavikrds [6]

Thinking frame not 100% sure

8 0

3 years ago

What is the pH of a solution that has a [H+] = 0.010 mol/L?

Serjik [45]

Answer:

pH = 2

A 0.010 M solution of hydrochloric acid, HCl, has a molarity of 0.010 M. This means that [H+] = 1 x 10-2 M. The pH of this aqueous solution of H+ ions is pH = 2

hope this helps :3

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5 0

3 years ago

Somebody tell me- why do cows go Moo?

m_a_m_a [10]

Answer:

To communicate with each other

Explanation:

Cows use sound (mooing) to communicate with each other and their environment. Cows are herd animals and have complex social structures. Mooing is one way that they interact and how they express their emotions

5 0

3 years ago

Read 2 more answers

Calculate the number of particles in a 0.75 gram sample of Calcium Nitrate; Ca(NO3)2

kkurt [141]

The number of particles : 2.75 x 10²¹

<h3>Further explanation </h3>

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

$\tt n=\dfrac{N}{N_o}$

N = number of particles

No = Avogadro number (6.02.10²³)

n = number of moles

While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule

0.75 gram sample of Calcium Nitrate; Ca(NO₃)₂

MW of Ca(NO₃)₂ : 164.09 g/mol

$\tt mol~Ca(NO_3)_2=\dfrac{0.75}{164.09}=0.00457$

The number of particles

$\tt N=n\times N_o\\\\N=0.00457\times 6.02\times 10^{23}=2.75\times 10^{21}$

5 0

3 years ago