Chemistry, 17.07.2019 01:30 tiffxnnyyy

What is the change in enthalpy for the following reaction? 2h2o2(aq) 2h2o(l) + o2(g) given: h2o: ∆h= -242 kj h2o2: ∆h= -609 kj

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Answer from: MJKjmkp1

Answer : The reaction will be $2H_{2}O_{2} ----\ \textgreater \ 2H_{2}O + O_{2}$ .

Now as the given enthalpy of $H_{2}O$ is -242 KJ
and the enthalpy of $H_{2}O_{2}$ is -609 KJ.

According to the formula of Hess's summation, ΔHreaction= (ΣΔHproducts)-(ΣΔHreactants)

Therefore, ΔHreaction = [ $H_{2}O$ + $O_{2}$ ] - $H_{2}O_{2}$

on substituting the values and omitting the value for oxygen as it is in gaseous state we get,
ΔHreaction = [0 + (2 X -242)] - [2 X -609]

on solving we get, ΔHreaction = 734 KJ.

Answer from: Starzdaze5572

The change in enthalpy is determined by the formula:

$\Delta H_{reaction} = \Sigma \Delta H_{products} - \Sigma \Delta H_{reactants}$

The reaction is:

$2H_2O_2(aq)\rightarrow 2H_2O(l)+O_2(g)$

Given:

$\Delta H_{H_2O} = -242 kJ$

$\Delta H_{H_2O_2} = -609 kJ$

The change in enthalpy for the reaction is calculated as:

$\Delta H_{reaction} = (2H_{H_2O}+H_{O_2}) - 2H_{H_2O_2}$

$H_{O_2} = 0 kJ$ (as it is in its standard state)

Substituting the values:

$\Delta H_{reaction} = (2\times (-242)+0) - 2\times (-609)$

$\Delta H_{reaction} = -484 kJ + 1218 kJ = 734 kJ$

Hence, change in enthalpy for the reaction is 734 kJ .

Answer from: Quest

water molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation:

Answer from: Quest

"the periodic table is arranged in order of atomic number."

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What is the change in enthalpy for the following reaction? 2h2o2(aq) 2h2o(l) + o2(g) given: h2o:...