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aniked [119]
3 years ago
14

The energy change ∆H associated with the reaction NBr3(g) + 3 H2O(g) → 3 HOBr(g) + NH3(g) is +81 kJ. NBr3 is arranged with all o

f the bromines attached to the nitrogen and HOBr is arranged as H O Br. The O H bond is 459 kJ The N H bond is 386 kJ The O H bond is 459 kJ The O Br bond is 201 kJ The strength of the N Br bond is
Chemistry
1 answer:
masha68 [24]3 years ago
6 0

Answer:

155 kJ

Explanation:

The energy change will be the energy of the reactants less the energy of the products. And the energy of each compound is the sum of the energy of their bonds. Let's call y the N-Br strength.

3HOBR = 3x(459 + 201) = 1980 kJ

NH₃ = 3x386 = 1158 kJ

3H₂O = 3x(2x459) = 2754 kJ

NBr₃ = 3y

3y + 2754 - 1158 - 1980 = 81

3y -384 = 81

3y = 465

y = 155 kJ

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How would you prepare the following aqueous solutions?
Xelga [282]

The  molarity of the solution is 0.1625M.

<h3>What do you meant by Molarity</h3>

Molarity is the amount of a substance in a certain volume of solution. Molarity is  defined as the moles of solute per litres of a solution .

Molarity → no of moles / Volume (L)

SI unit of Molarity is M or mol/ L

We have given here the mass of solution is 3.10×10²g .

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Molality → no of moles / mass in kg

→  0.125×3.10×10²/ 1000

→ no.of moles = 0.0162

For  molarity we can assume volume as 1000 ml .

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2 years ago
An ideal gas contained in a piston which is compressed. The gas is insulated so that no heat flows into or out of it. 1) What ha
Goryan [66]

Answer:Temperature increases

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We know ideal gas equation to be PV=nRT where

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since the gas is insulated such that no heat goes into or out of the system .

When we compress the ideal gas using a piston, Thermodynamically it means that work is done on the system by the surroundings.

Now as the ideal gas is been compressed so the volume of the gas would decrease and slowly a time will reach when no more gas can be compressed that is there cannot be any further decrease in volume of the gas.

From the equation PV=nRT

Once there is no further compression is possible hence volume becomes constant so pressure of the ideal gas becomes directly proportional to the temperature as n and R are constants. Also as the pressure and volume are inversely related so an decrease in volume would lead to an increase in pressure.

As the ideal  gas is compressed so the pressure of the gas would increase since the gas molecules have smaller volume available after compression hence the gas molecules would quite frequently have collisions with other gas molecules or piston and this collision would lead to increase in speed of the gas molecules and  so the pressure would increase .

The increase in pressure would lead to an increase in temperature as show by the above ideal gas equation because the pressure and temperature are directly related.

So here we can say that work done on the system by surroundings leads to increase in temperature of the system.

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