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Shtirlitz [24]
3 years ago
6

Nitric oxide (NO) can be formed from nitrogen, hydrogen and oxygen in two steps. In the first step, nitrogen and hydrogen react

to form ammonia:
N2(g) + 3H2(g) →2NH3(g)
ΔH=−92.kJ
In the second step, ammonia and oxygen react to form nitric oxide and water:
4NH3(g) + 5O2(g) → 4NO(g) +6H2O(g)
ΔH=−905.kJ
Calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions.
Chemistry
2 answers:
storchak [24]3 years ago
6 0

Answer: The net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen is -272.2 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given chemical reactions  are,

N_2(g)+3H_2(g)\rightarrow 2NH_3(g)     (1)

\Delta H_1=-92kJ

4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)     (2)

\Delta H_2=-905kJ

Now we have to determine the value of \Delta H for the following reaction i.e,

\frac{1}{2}N_2(g)+\frac{3}{2}H_2(g)+\frac{5}{4}O_2(g)\rightarrow NO(g)+\frac{3}{2}H_2O \Delta H_3=?

According to the Hess’s law, if we multiply the reaction (1) by 1/2, (2) by 1/4 and then add (1) and (2)

So, the value \Delta H_3 for the reaction will be:

\Delta H_3=\frac{1}{2}\times (-92kJ)+\frac{1}{4}\times (-905kJ)

\Delta H_3=-272.2kJ

Hence the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen is -272.2 kJ

tatiyna3 years ago
5 0

Answer:

ΔH = - 272.255 kJ      

Explanation:

Given that

In first step ,reaction is given as

N2(g) + 3H2(g) →2NH3(g)                  ΔH=−92 kJ

In second step ,reaction is given as

4NH3(g) + 5O2(g) → 4NO(g) +6H2O(g)             ΔH=−905 kJ

Now multiple by in the first equation ,we get

2N2(g) + 6H2(g) →4NH3(g)                  ΔH=− 184 kJ

Now by adding the above equation

2N2(g) + 6H2(g) →4NH3(g)                  ΔH=− 184 kJ

<u>4NH3(g) + 5O2(g) → 4NO(g) +6H2O(g)             ΔH=−905 kJ</u>

2 N2+6 H2 + 5 O2 → 4 NO + 6 H2O       ΔH=  - 1089 k J

For one mole of nitric oxide (NO)

\Delta H=\dfrac{-1089}{4}= -272.255\ kJ

ΔH = - 272.255 kJ

Therefore change in the enthalpy will be - 272.255 kJ.

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nexus9112 [7]

This question is incomplete, the complete question is;

Describe how to use a transfer pipet to deliver 10.00 mL of liquid by placing the following steps in the correct order;

- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.

- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.

- Transfer the pipette to the receiving vessel.

- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.

- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.

- Suck up a third volume of liquid past the 10.00 ml calibration mark.

- Discard the first two pipette volumes of the liquid to rinse the pipette.

Answer:

- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.

- Discard the first two pipette volumes of the liquid to rinse the pipette.

- Suck up a third volume of liquid past the 10.00 ml calibration mark.

- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.

- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.

- Transfer the pipette to the receiving vessel.

- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.  

Explanation:  

First of all, We use a suction device to suck up liquid into pipet. Then we will fill the pipet up to the 10 mL marks and will discard the initial two volumes of liquid and will take a final third volume. We will replace the bulb with index finger and will drain it by placing the tip of pipet at the wall of beaker and drain the liquid.

Arranged in the following steps correctly;

- Use a rubber bulb to suck liquid up past the 10.00 ml calibration mark.

- Discard the first two pipette volumes of the liquid to rinse the pipette.

- Suck up a third volume of liquid past the 10.00 ml calibration mark.

- Replace the bulb with your index finger and wipe excess liquid off the outside of the pipette.

- Place the tip of the pipette against the side of the beaker and drain the liquid from the pipette until the bottom of the meniscus reaches the calibration mark.

- Transfer the pipette to the receiving vessel.

- Drain the pipette by gravity while holding the tip against the side of the receiving vessel.

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Explanation:

1)Given data:

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now we will compare the moles of KOOH and LiClO.

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