Chemistry, 12.06.2020 04:57 yurionice42069

PLZ SEE ATTACHED AND I WOULD REALLY APPRECIATE IT! ANYONE GOOD WITH CHEM

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Answer from: Swetjyil

Answer : The value of $\Delta H_{rxn}$ for the reaction is, -390.3 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 main chemical reaction is:

$CH_4(g)+4Cl_2(g)\rightarrow CCl_4(g)+4HCl(g)$ $\Delta H_{rxn}=?$

The intermediate balanced chemical reaction are:

(1) $C(s)+2H_2(g)\rightarrow CH_4(g)$ $\Delta H_1=-74.6kJ$

(2) $C(s)+2Cl_2(g)\rightarrow CCl_4(g)$ $\Delta H_2=-95.7kJ$

(3) $H_2(g)+Cl_2(g)\rightarrow 2HCl(g)$ $\Delta H_2=-184.6kJ$

Now we are reversing reaction 1, multiplying reaction 3 by 2 and then adding all the equations, we get :

(1) $CH_4(g)\rightarrow C(s)+2H_2(g)$ $\Delta H_1=74.6kJ$

(2) $C(s)+2Cl_2(g)\rightarrow CCl_4(g)$ $\Delta H_2=-95.7kJ$

(3) $2H_2(g)+2Cl_2(g)\rightarrow 4HCl(g)$ $\Delta H_2=2\times (-184.6kJ)=-369.2kJ$

The expression for enthalpy change for the reaction will be,

$\Delta H_{rxn}=\Delta H_1+\Delta H_2+\Delta H_3$

$\Delta H_{rxn}=(74.6kJ)+(-95.7kJ)+(-369.2kJ)$

$\Delta H_{rxn}=-390.3kJ$

Therefore, the value of $\Delta H_{rxn}$ for the reaction is, -390.3 kJ

Answer from: Quest

No table found. the question asks for covalent bond based on electronegativies

Answer from: Quest

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

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