Chemistry, 21.11.2019 09:31 nicog94

The reaction between hydrogen and oxygen to yield water vapor has δh∘=−484kj: 2h2(g)+o2(g)→2h2o(g)δh∘=−484kj

how much pv work is done in kilojoules for the reaction of 3.20 mol of h2 with 1.60 mol of o2 at atmospheric pressure if the volume change is −22.6l?

express your answer using three significant figures

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Answer from: fordd4

The PV work in kilojoules for the reaction is $\boxed{2.29\;{\text{kJ}}}$ .

Further Explanation:

First law of thermodynamics:

The law states that energy cannot be created or destroyed but only changes its form and versa.

The internal energy of the system defines the total energy of the system and is sum of enthalpy of the system and work done. Internal energy only depends on the temperature of the system. The mathematical expression of the internal energy is as follows:

${\text{U}} = {\text{H}} + {\text{W}}$

Where,

U is the internal energy of the system.

H is the enthalpy of the system.

W is the work-done.

The formula for workdone by the system is as follows:

${\text{W}} = - {\text{P}}\Delta {\text{V}}$

Where,

P is the pressure in atmosphere.

$\Delta {\text{V}}$ is the change in the volume in liter.

The atmospheric pressure is $1\;{\text{atm}}$ .

The change in volume is $- 22.6\;{\text{L}}$ .

Substitute these values in above equation to calculate the work done by the system.

$\begin{aligned}{\text{W}}&= - {\text{P}}\Delta {\text{V}}\\&= - \left( {1\;{\text{atm}}} \right)\left( { - 22.6\;{\text{L}}} \right)\\&= 22.6\;{\text{L}} \cdot {\text{atm}}\left( {\frac{{0.101325\;{\text{kJ}}}}{{1\;{\text{L}} \cdot {\text{atm}}}}} \right)\\&= 2.2899\;{\text{kJ}}\\\end{aligned}$

The correct answer in 3 significant figures is $2.29\;{\text{kJ}}$ .

Learn More:

Determine the enthalpy of a reversed reaction: Find the enthalpy change of a reaction:

Answer Details:

Grade: Senior School

Chapter: Thermodynamics

Subject: Chemistry

Keywords: Internal energy,thermodynamics,PV work, kilojoules, volume change, enthalpy, work done. significant figures,2.29KJ, atmospheric pressure.

Answer from: Quest

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

Answer from: Quest

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The reaction between hydrogen and oxygen to yield water vapor has δh∘=−484kj: 2h2(g)+o2(g)→2h2o(g)δ...

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