Pyetja #431 - Kimi

Question

Kur eteri dimetilik $\text{CH}_3\text{OCH}_3$ digjet në trysni konstante, sipas barazimit: $$ \text{CH}_3\text{OCH}_3{}_{(l)} + 3\text{O}_2{}_{(g)} \rightarrow 2\text{CO}_2{}_{(g)} + 3\text{H}_2\text{O}_{(l)} $$ çlirohen $1450\ \text{kJ}$. Njehsoni $\Delta H$ nëse digjen $2.61\ \text{g}$ të këtij eteri. $$ A_r(\text{C}) = 12 $$ $$ A_r(\text{O}) = 16 $$ $$ A_r(\text{H}) = 1 $$ A) $-82.2\ \text{kJ/mol}$ B) $-822\ \text{kJ/mol}$ C) $-435\ \text{kJ/mol}$ D) $-43.5\ \text{kJ/mol}$

Amarildo Koçiaj · Accepted Answer

Pyetja Kur eteri dimetilik $\text{CH}_3\text{OCH}_3$ digjet në trysni konstante, sipas barazimit: $$ \text{CH}_3\text{OCH}_3{}_{(l)} + 3\text{O}_2{}_{(g)} \rightarrow 2\text{CO}_2{}_{(g)} + 3\text{H}_2\text{O}_{(l)} $$ çlirohen $1450\ \text{kJ}$. Njehsoni $\Delta H$ nëse digjen $2.61\ \text{g}$ të këtij eteri. $$ A_r(\text{C}) = 12 $$ $$ A_r(\text{O}) = 16 $$ $$ A_r(\text{H}) = 1 $$ A) $-82.2\ \text{kJ/mol}$ B) $-822\ \text{kJ/mol}$ C) $-435\ \text{kJ/mol}$ D) $-43.5\ \text{kJ/mol}$ Zgjidhja Reaksioni i dhënë tregon djegien e $1\ \text{mol}$ eter dimetilik: $$ \text{CH}_3\text{OCH}_3{}_{(l)} + 3\text{O}_2{}_{(g)} \rightarrow 2\text{CO}_2{}_{(g)} + 3\text{H}_2\text{O}_{(l)} $$ Meqë gjatë djegies çlirohen $1450\ \text{kJ}$, shenja e entalpisë është negative: $$ \Delta H = -1450\ \text{kJ/mol} $$…

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