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Fittoniya [83]
3 years ago
8

Which equation best represeents the balanced net ionic equation for the reaction that occurs wehn aqueous soluitons of litium ph

osphate and magnesium nitrate are mixed?
Chemistry
1 answer:
-BARSIC- [3]3 years ago
5 0
Answer : The reaction that occurs when we mix the aqueous solutions of Lithium phosphate and Magnesium nitrate is as follows :-

2LiPO_{4}    +   Mg(NO_{3}) _{2}  ----\ \textgreater \  Mg  _{3} (PO_{4} ) _{2}   + 2 LiNO_{3}

A simple displacement reaction occurs in the above reaction with the net ionic equation given below :-

2(PO _{4} ) ^{3-}  _{(aq.)}    +   3 Mg ^{+2} _{(aq.)} ----\ \textgreater \  Mg _{3} (PO _{4}) _{2 _{(s)} }

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3 years ago
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<u>Answer:</u> The \Delta H^o_{rxn} for the reaction is 51.8 kJ.

<u>Explanation:</u>

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

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

The chemical equation for the reaction of carbon and water follows:

2C(s)+2H_2(g)\rightarrow C_2H_4(g) \Delta H^o_{rxn}=?

The intermediate balanced chemical reaction are:

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(2) H_2+\frac{1}{2}O_2(g)\rightarrow H_2O(l)    \Delta H_2=-285.9kJ     ( × 2)

(3) 2C_2H_4(s)+2O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)    \Delta H_3=-1411kJ

The expression for enthalpy of the reaction follows:

\Delta H^o_{rxn}=[2\times \Delta H_1]+[2\times \Delta H_2]+[1\times (-\Delta H_3)]

Putting values in above equation, we get:

\Delta H^o_{rxn}=[(2\times (-393.7))+(2\times (-285.9))+(1\times -(-1411))]=51.8kJ

Hence, the \Delta H^o_{rxn} for the reaction is 51.8 kJ.

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