Pyetja #423 - Kimi

Question

Janë dhënë barazimet termokimike: $$ \text{N}_2{}_{(g)} + \text{O}_2{}_{(g)} \rightarrow 2\text{NO}_{(g)} \qquad \Delta H^\circ = +180.8\ \text{kJ} $$ $$ \text{N}_2{}_{(g)} + 2\text{O}_2{}_{(g)} \rightarrow 2\text{NO}_2{}_{(g)} \qquad \Delta H^\circ = +66.6\ \text{kJ} $$ Sa është entalpia e reaksionit në kushte normale? $$ \text{NO}_{(g)} + \frac{1}{2}\text{O}_2{}_{(g)} \rightarrow \text{NO}_2{}_{(g)} $$ A) $-90.0\ \text{kJ}$ B) $+33.3\ \text{kJ}$ C) $-57.1\ \text{kJ}$ D) $-114.2\ \text{kJ}$

Amarildo Koçiaj · Accepted Answer

Pyetja

Janë dhënë barazimet termokimike:

\[ \text{N}_2{}_{(g)} + \text{O}_2{}_{(g)} \rightarrow 2\text{NO}_{(g)} \qquad \Delta H^\circ = +180.8\ \text{kJ} \]

\[ \text{N}_2{}_{(g)} + 2\text{O}_2{}_{(g)} \rightarrow 2\text{NO}_2{}_{(g)} \qquad \Delta H^\circ = +66.6\ \text{kJ} \]

Sa është entalpia e reaksionit në kushte normale?

\[ \text{NO}_{(g)} + \frac{1}{2}\text{O}_2{}_{(g)} \rightarrow \text{NO}_2{}_{(g)} \]

A) $-90.0\ \text{kJ}$

B) $+33.3\ \text{kJ}$

C) $-57.1\ \text{kJ}$

D) $-114.2\ \text{kJ}$

Zgjidhja

Kërkohet entalpia e reaksionit:

\[ \text{NO}_{(g)} + \frac{1}{2}\text{O}_2{}_{(g)} \rightarrow \text{NO}_2{}_{(g)} \]

Ky reaksion ka $1\ \text{mol}$ $\text{NO}$, ndërsa barazimet e dhëna janë me $2\ \text{mol}$ $\text{NO}$ dhe $2\ \text{mol}$ $\text{NO}_2$. Prandaj fillimisht do të gjejmë entalpinë për reaksionin:

\[ 2\text{NO}_{(g)} + \text{O}_2{}_{(g)} \rightarrow 2\text{NO}_2{}_{(g)} \]

Pastaj…

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